This game is really fun!
I love the short little rising percussion fx in the music - almost sounds like an 8-bit bark to me, pitched-up or from a small dog.
I guess I'd call the music "dog techno"? hahaha
The only thing I have any feedback on is the damage values. Tennis ball hits harder than the dog & can be spammed faster (even if you recall before each shot, which you don't need to) so the dog doesn't feel like the main thing here, but more like you're knocking the mailmen out with tennis balls and the dog is just kind of helping.
Honestly, though? The game's still really good.