Very cool concept, really enjoyed playing it through.
My main critique is that I really didn't really feel like I controlled the spread of the green and was kinda just shooting till enough butterflies spawned to complete the level.
Thanks for playing!
Yeah, I see what you mean. We could probably improve on the level design more by testing if a level is able to be passed without the butterflies so there's a solution that doesn't rely on getting lucky with the amount of butterflies spawned. Thanks for the feedback, really appreciate it!