Sorry to hear that happened to you, the idea is that enemy spawns have a limit per spawn location to encourage the player to move around the level. There are enough enemies per level to go above and beyond the kill requirement. Perhaps try exploring the level more?
Perhaps, but I think the player should have a bit more time.
Btw, I think I forgot to write something positive in my comment :D Overall the game is cool, I like shooting on a beat mechanic and art is very nice to look at :)
