Marcin Smoła — Game Developer & Programmer (fcolor04) on Smolalab

About

Mon, 01 Jan 0001 00:00:00 +0000

Hi, I’m Marcin Smoła — most people online know me as fcolor04.

I’m an indie game developer and programmer. I build and ship games under my publishing name Nova Reactor (titles like Mr. Cloak, Jump Challenge!, GeoJelly and Land of Mushrooms), and I work as a programmer at Source Byte, where I’ve contributed to shipped console and PC releases since 2021.

What I do

Gameplay & systems programming — primarily Unity (C#) and Godot (GDScript).
Lower-level tinkering — C++, Zig and Odin, including graphics bindings and tools.
Tooling — editor extensions and pipelines that make day-to-day dev faster.
Shipping — I care about taking features from idea to a release players actually hold.

Find me

GitHub: FColor04
itch.io: fcolor04.itch.io
Twitter/X: @FColor04

I’m open to work

If you’re looking for a developer who can own a feature end-to-end — gameplay, systems, tooling, or performance — I’d love to hear from you: fcolor04@pm.me.

Why I Built Smolalab

Thu, 01 Jan 2026 00:00:00 +0000

For a long time my work was scattered: games on itch.io and Steam, code on GitHub, the occasional devlog, and conversations on Discord. None of it lived in one place.

I built Smolalab to fix that. It’s the umbrella for everything I make — games, software projects and writing — with enough room to give each thing its own page instead of a one-line link.

It’s also a way to show how I work. Every game here has tags, a release date and a short note on what it is and why I made it. Every software project is color-coded by language so it’s obvious at a glance what’s under the hood. And it’s built to be fast and search-friendly, so people can actually find it.

Downcycling

Sun, 23 Nov 2025 00:00:00 +0000

A post-apocalyptic puzzle run about rerouting danger and carrying unstable resources. Hijack a NOMADbot through the machines’ network, grab a radiation chunk and use it to break the systems protecting each door — while the same chunk slowly decays your connection.

This was a playground for systems I’m proud of: item-driven behaviour mods, an inventory system, music playback that survives volume changes, input rebinding and dynamic input icons. My first real Godot project, and I came away very happy with the engine.

Railoop

Sun, 03 Aug 2025 00:00:00 +0000

A tactical rail-defense prototype where every loop you build changes how your defenses move and survive. Lay rails in a loop, drop a station, buy a train, arm it and send it down the track. Visit mines for resources, plan by day, and commit to defending your property by night.

Built in 4 days for GMTK Game Jam 2025. Open to further development if it finds an audience.

Break The Bones

Sun, 09 Mar 2025 00:00:00 +0000

A deck-building combat prototype exploring card pacing and quick encounter decisions. Win three fights to clear the demo. A fun, deliberately small experiment in card systems — made for Micro Jam 035.

Mr. Cloak

Sun, 15 Dec 2024 00:00:00 +0000

About the Game

Mr. Cloak is a challenging 2D stealth adventure game developed by indie developer Marcin Smoła (fcolor04). Set in the unforgiving labyrinth beneath Dravaneth, you must use your wits, read enemy patrol patterns, and carefully choose your path to survive.

In this pixel art platformer, light is your biggest enemy. You must stick to the shadows, avoid line-of-sight, and grab the keys to escape before you are caught.

Land of Mushrooms

Thu, 31 Oct 2024 00:00:00 +0000

Land of Mushrooms blends adorable chaos with quick decisions. Merge mushroom types to grow tiny fungi into massive chains, control board pressure and chase bigger combos — solo or in co-op score races.

My most recent Source Byte console release, out across PC and all three major platforms.

How it plays

Merge matching mushrooms into bigger, higher-scoring chains.
Manage space and hazards before the board overwhelms you.
Co-op mode turns score-chasing into a friendly rivalry.

Down and North

Mon, 22 Jan 2024 00:00:00 +0000

A narrative platformer built around storytelling and traversal, made for the Tell a Story Jam. A short, mood-focused collaboration where the journey and the telling matter more than the challenge.

Solitude Echoes

Sun, 10 Dec 2023 00:00:00 +0000

A story-driven 2D horror adventure where silence shapes every choice — and not every quiet ending is a good one. A ~20-minute journey with light puzzle and horror elements, built around the idea that keeping silent is a double-edged sword. Made with a team of five for UDC Jam #28: Silence.

Dagger's Edge

Mon, 16 Oct 2023 00:00:00 +0000

An RPG where you battle your foes using cards. Each party member has their own deck, so choose carefully — playing a card exhausts the caster for a few turns, making their hand unavailable. Plan your moves, fight your way out of the prison and take on the inki boss.

A crunch-time team jam for Mini Jam 143: Ink, where we built the whole combat loop around card interactions.

GeoJelly

Wed, 11 Oct 2023 00:00:00 +0000

GeoJelly is a precision puzzle platformer set in experimental chambers where every charged jump is a commitment. Aim, charge and launch — then live with the consequence as you collect diamonds and unlock tougher routes.

Another Source Byte release, shipped to PC and consoles.

What makes it tick

Every jump is a deliberate, charged commitment — no take-backs.
Puzzle routing and physics decide how each room clears.
Diamonds gate access to harder, optional routes for completionists.

Plenty of Fish

Sun, 09 Jul 2023 00:00:00 +0000

A casual indie action-adventure where you control a school of fish trying to survive inside an ocean. Avoid the fishing boats — and turn the tables by taking them down yourself. A “roles reversed” collaboration made for GMTK Game Jam 2023.

Lufthavn Galaxy Zoo

Mon, 01 May 2023 00:00:00 +0000

An action shooter set inside a chaotic space zoo, where survival and mission pressure escalate together. A virus has turned the zoo’s creatures hostile and you have to fight your way in to deliver the cure before time runs out. Four weapons to find, hidden easter eggs, and a survive-as-long-as-you-can loop.

Made for GoedWare Game Jam #8 with Denys Topchaniuk. I wrote a jam-summary devlog breaking down scope, AI behaviour and weapon systems.

Carlito's Nightmare

Tue, 28 Feb 2023 00:00:00 +0000

A cozy shoot-’em-up with roguelike upgrades where Carlito, a lazy Persian cat, fights through increasingly bizarre dream monsters. Defeat them, level up and transform into a bullet hell that becomes their worst nightmare. A collaboration for Buddy Up Jam: Winter 2023 (theme: “soft”).

Time Journey

Sun, 05 Feb 2023 00:00:00 +0000

A 2D side-scrolling adventure and puzzle about finding a path to your past. Your only tool is a flag: throw it to break the puzzles in your way, recall it, and travel between past and present to progress. Made for Mini Jame Gam #14.

Boss Beat

Mon, 09 Jan 2023 00:00:00 +0000

A rhythm-combat experiment that syncs boss patterns with music-driven timing windows. Just two inputs — left and right — so the whole game lives in pure timing. Try not to panic, and share your scores.

MiniKnight: Yara

Sat, 24 Dec 2022 00:00:00 +0000

A voxel hack-and-slash adventure through a randomly generated Christmas world. Slash, dash and unleash magic combos, collect resources to boost your stats, and take on an epic boss to save the holiday. I especially loved scripting the renderers for the unique mix of 3D with 2D — read the release devlog. Made for Jame Gam Christmas Edition.

Jump Challenge!

Fri, 18 Mar 2022 00:00:00 +0000

Jump Challenge! is a high-speed arcade platformer where rising lava, trap timing and movement precision define every run. It’s built for quick retries, score chasing and competitive local multiplayer chaos.

I worked on this title at Source Byte, shipping it across PC and all three major consoles.

Why it stands out

Constant pressure from rising hazards keeps every jump meaningful.
Stage design rewards rhythm, route memory and controlled risk.
Multiplayer-focused modes make it ideal for couch competition.

Toady I Learned

Fri, 31 Jul 2020 00:00:00 +0000

A short, weird top-down adventure about a small frog that eats and grows. One of my earliest jams — made in just 3 days for Vertex Game Jam 2020 together with Bitter from BadAlchemy Studios.