Not too shabby, but a bit rough around the edges here and there!
Overall it was a pretty cute game. There was a little bit of getting used to the controls at first: everything felt like it moved so fast and so snappy, but it wasn't too bad once I got used to it (though some jumps in tight places were annoyingly tricky because of this at times). Enemy variety was pretty decent, and I appreciated the little touches here and there like the volcano flowers not hurting you if you touch them, and also having visible telegraphs to let you know when they're about to attack. Bosses were cool as well and it was fun to see the various worlds to go through.
The game did have a lot of wonkiness to it, however. Hit detection for the water balloons could be very annoyingly inconsistent at times: I would have times where I would break a block that was right behind a block in front of it, or even worse, sometimes I would hit a block that an enemy was standing on top of or next to instead of the enemy itself! Even worse, I would have times where I would try to shoot a water balloon downwards from the double-jump to hit an enemy below me, only for it to hit the wall I'm next to instead which makes no sense, and would lead to me falling down and dying from hitting the enemy I tried to shoot! It was real annoying to try and account for this weird hit collisions by giving a wide berth and staying away from walls and such.
There was some other minor nitpicks like how it seems to lack a save system and that it didn't really have great VFX/SFX for pizazz which was a bummer, but I shan't harp on, haha.
While I found the game to be a bit too overly simple and without some real meat on its bones to keep me hooked, it nevertheless was a pretty decent little adventure and obviously impressive to get it done for Pixel day, so well done in that regard!
As a side note, I found the controls introduction a bit annoying: I'd prefer if instead of flashing through the controls in a loop, you just display all of the controls at once with different colors for each so I can read at my own pace. Also, for some reason, I can't proceed if I hit X, only if I hit M! How odd.