Took me a while to figure out that i only had to clear the roads, not the entire map, I was like wtf how long do these levels take.
I would make it so you can find out if you have cleared enough of the level to finish it without ending the level and restarting (maybe like a little ui) as I did that a couple times and its annoying to have to start over.
I like the effect when you hit a tree and how you can double mow and fk up peoples lawns.