Bad.
4 for the art, but everything else is terrible. If you fix the glitches it could be a decent little mini game, but with them it's just annoying and not fun at all. The hit box on Stamper is awful. You're going to hit the bees almost every time if your anywhere near them because it's off by quite a few pixels. When you clear a cactus you still lose health because there's also a large invisible hit box on his feet.
The cross that gives you health takes away half of your health a lot of the time. Sometimes it gives you no health at all. You win medals every game you play even if you unlocked them, which is extremely annoying. The game starts right when you click the mode you want, so it's very hard to get a good start when you click then have to move your hand down to the arrow keys in time before you run into a cross that takes away half of your health. A five second start would be a lot more convenient.
Just not a fun game at all even if the idea is kinda funny.