The game engine is written in such a way that allows for porting to other platforms. Unfortunately I haven't had the chance to do this yet. The goal is to do this some time post release. This will depend on many factors, so please keep that in mind.
If the game makes it through Steam Greenlight (please vote to help us get there - see link in the project description) backers will be given an option to redeem a Steam key. The same applies to any other platform that handles this issue in a similar way.
Don't see the answer to your question? Ask the project creator directly.