Very good game in every aspect, that's something I never thought of when they announced the jam theme, I liked that you added physics to the grass (or maybe be just animation), the animation of the paper when you select the level is also a good idea, you can see from this detail that you finished the game earlier and were comfortable to add details.
the only downside is that the lawn mower when hit wall with some speed starts to bug(it like his Z-axis changed), but very good game !