Thanks a lot for posting this. It is amazing to see people playing my game on all sort of devices. I spent a lot of time making it playable with mouse, keyboard, touch, and so on, so I'm happy to see that it was worth it :) I don't know if there is an optimal control scheme; in the end, it's not an action game. I would probably use the B button (A button on a XBOX controller) for Enter/activate, A for TAB, the d-pad for cursors, and either X or Y for Esc. With cursors/enter/tab/esc, you can do everything. You can hide the mouse cursor if you map the H key with a button. You can also map additional keyboard shortcuts if you want (e.g. L for long-range sensor scan can be very useful). Have fun and let me know what you think about the difficulty level!