Wow, you made it to the 5th level, congratulations! THANK YOU A MILLION for your feedback, I'll definitely consider the proposed improvements. Thank you again! :)

I had fun when I played the game, and after closing it, I actually wanted to play it again. I was curious about the other levels too.
I noticed this the first time I played as well: in the screenshot, one of the harmful mobs got stuck above the black hole in the top-right corner. Sometimes it also feels like they pass over the black holes instead of falling into them.
The first time I played, I focused mostly on dropping the harmful mobs. This time I focused more on collecting the stars, and the game ended faster than I expected. :D
Looks like you need to make more levels for me.