Hey Dominik! Thanks for checking out my game!
Unfortunately, I probably won't update this game due to stuff irl, but if I make something similar in the future, I'll keep these in mind.
Suggestion 1 - That's a pretty neat idea that I overlooked when developing
Suggestion 2 - They weren't supposed to disappear originally. However, when I was trying to make an Android version, I made several optimizations - minimizing enemy count was one of them. That being said, that was probably the most short sighted approach I've taken.
Suggestion 3 - That I've not heard of. Definitely a bug
Still, thanks for the input man!