I liked this one a lot. I found the platforming challenging but very fair, the only thing I would change is make it so that if you try to shoot a bubble while one is already active, instead of having to wait a cooldown, make it so that the existing bubble explodes to allow the new one to spawn, that way you still only allow players one bubble and the time between misfired bubbles is diminished.
I love the artstyle, it's very cute and polished. The music and sound effects were also very nice. You made a really good game, be proud!! :D