Haha, Ill check a look. On the Windows version the controls do function and it seems on my end the '2' key does work on my side. Ill check a look to see if I need to do something special.
Also Ill check a look at Bit's kill condition but that is changing anyway in 0.2.0. Also funny fact, we do have invincible enemies programmed but not used currently. Perhaps in the future~