The ultimate "dad-type" game. Fun to see the lawn mower get bat wings as its upgraded :)
The two things I really felt like were missing were a lawn mower sound (maybe not a traditional one, because loud lawn mowers can sound loud and annoying, but maybe something more fantastic like a sports car engine) and leaving a trail behind the mower (that's one of the really satisfying things about mowing the lawn IRL -- the nice clean path you leave behind).
Nice work on the pixel art too, it looks good!