Cute and fun overall, very easy and made me feel like a gruesome shepherd. Really fun, I'd love to see more upgrades and something to make the game stand out a bit more. Maybe an ending or some scene for me getting all upgrades.
In My Opinion:
If you limit upgrades -> Add an ending for the players to chase
Instead
Don't limit upgrades -> Have them scale infinitely, make the game fun for the player to see how crazy and OP you can get.