Thanks! Some bat sounds were actually missing which I recently patched.
Yeah, once a summoner screeches, the number of bats can get overwhelming. Maybe the lack of sound made the summon mechanic unclear? If you knock them out consistently you should have no problem. I actually made some minor balance adjustments but I don't know if that makes it much easier.
Nothing much happens after the bar fills up lol. The bats stop spawning and you win.
Hope to add a "Try Again" button at some point, maybe post-jam. Thanks for playing!