I really loved the experience but I hope you add more kinds of gamemodes other than corridor walker, maybe something with more enemies like a zombies horde defence mode?
Also where can I send a donation?
Currently I focus on the main mode. Although it will include more than just walking through corridors. Other modes that I'd like to add I leave for later. I'd love to add multiplayer too but that is not going to happen before release (I have plenty ideas how and what but it's better to do a few things properly than start doing way too many and not finish them).