This was pretty fun! It was cool being able to massively upgrade the weapons with no upper limit. It would have been cool if there were a couple new weapons, or a couple upgrades that did some other effects as well. My favorite upgrade was probably the one that added another shot to your Smile attack, since that added some extra strategy of trying to aim your shot to be able to attack two enemies with one shot. Some more effects like that - maybe the Smile attacks can bounce x+1 times after hitting an enemy, or throwing more Sweets out when you use the explosion attack - could do a lot to break up the normal strategy of just kiting around enemies.
Also, some feedback about what I'm hitting with the attacks would help a lot too, once a lot of enemies bunched up, it was kind of hard to tell what I was attacking when I was shooting into the horde.