I'll have to check that bug of getting hit by nothing, since I also got it before the boss.
For the pause I'll have to find another song or put the song back to where it was on unpause since I tried coordinating enemies with music like they do in arcade STG.
The enemies actually can take more hits the more players there are, but I haven't playtested it that too much. But changing enemies sounds like a better idea (just a bit more work).
Thanks for the review.