Alt+Enter probably doesn't work in the Linux version either.
And, yeah, I know the new release is criminally overdue... 
Oh yeah, it still doesn't work, on the Linux Version on Linux Mint 17.2.
Same with the Windows Ver. it seems, I've also noticed that when switching between windowed and fullscreen the program will minimize itself (not sure if WINE or just something else, assuming WINE since I have no real ver of windows to use ATM...), and that's it so far.
Also, just a little criminally, but if it's good I'm okay waiting for a while for it.