@Jupiter Hadley: You're right, I should have made an exe. I didn't do that because I had some troubles uploading it some time ago (bad internet connection). But I'll do that next time and I'll try to upload the exe for this game soon.
If you want to run the source, you'll need the godot game engine, unpack the source zip and import the engine.cfg file in godot. Than you can run the game.