I also stumbled a bit with the keys, but I did like the puzzle aspect of the game. Too bad it was so short, but game jams are game jams... It's a solid prototype at least.
The downloadable Linux version seems to be missing some files. When I tried to launch it I just got the following message "error: Couldn't load game path '.'", it also provided a usage help though, which contained the following: "-path [dir] : Path to a game, containing engine.cfg" and sure enough, such a file was present in your GitHub. After cloning the repository and moving the binary and the .pck file in there it worked just fine.