Nice game, and interesting art style and I like the level up idea! I think that the longer I play, the more black bugs appear in the game. And at one point there are so many that it is difficult to avoid them.
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Sorry for late reply. I am not sure what is the direction you wanna take, but here are my ideas
Have a way to deal with the black bugs in any way possible, as they are unbeatable, and will remove everything else.
Try to count how many bugs gets removed in 5 minutes and then add an insect respawner that respawns every 5 minutes with an average amount close to the amount of removed bugs.