This is an interesting idea, but maybe it needs to be balanced a bit more.
I just spawned as many critters as possible in the beginning and then I could just wait and upgrade with no issues.
Also, the music stopped playing? Maybe it isn't set to loop?
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Thank you so much for the comment! Yeah, because I was trying to come up with some new idea for the game and not copy anything, I made something weird. :D I was afraid to make this game too hard, because I heard you have to watch out for that. And I probably overdid it. :D
I fixed the music thing during development, but when I exported it, it broke again, I don't know why.