I'm sure many do, but subjectivity matters in this context. That is to say I haven't had many Linux players for my own game, and therefore it is likely to have more bugs. I'm sorry for the rough first impression, I hope to get these things fixed as soon as I can.
The game is still in alpha status so a few bumps are to be expected, more testers greatly helps process. I'll add the F11 problem to the bug tracker too, I can't imagine why the engine would have such a broken Linux build -- the engine core developers all use Linux primarily. I'll do some digging