Yo! I'm on fedora22 64 bit. Game menu's are reeeaaally unresponsive. I could barely get past the initial menu screen, and choosing the loadout was really difficult. I had to really incessantly click on the weapon icons. I haven't really played the game yet, but it looks like a fun time. Especially on linux where these kinds of games are not common at all.
Is there anything you can do to fix the UI issues?
EDIT: I managed to get into the game and play a bit. The thing with UI is weird. If I move my mouse above the UI buttons, then I can click them. It seems the mouse cursor and the mouse hitbox don't match.