At first it seems like catching the butterflies will be hard, but once you master the controls, it is the boxes work that defeat you lol Got 22 butterflies and 57 boxes, defeat by losing the job.
You have some kind of border/frame around your game, it would be interesting to see it shrink as you lose the will to live (maybe a little to dark... )
Maybe the box work could be easier (replenish more) and then change the butterflies to be harder as that was the more interesting part of the game. Maybe multiple butterflies at once if that was the case.
Oh, and sounds. It would feel nice to have some for the boosters or collecting butterflies