Unique idea, and very cute game. I like the upgrade system. 

The graphics are very attractive. I appreciate that the color schemes for the four types of monster are not red/green/blue/yellow, but something more subtle than that.

Overall, this was very fun to play, but I had a lot of trouble aiming properly. I think it would be very helpful to have a visible splash that shows the player exactly the area of effect when a potion lands; this would allow the player to calibrate their aim on the next shot.

Lovely visuals, nice audio track!

This one's really cute!