I loved the music and sound effects. The bubble blowing idea is awesome, but I found it a little bit hard to control. At first, I didn't realize that you could hold down the jump button for a long time and stay it the air much longer. It was a little easier after I figured that out, but still tough.
The game also seemed to have some minor performance issues with the screen freezing occasionally. Although that might just be my PC, it seems to often have issues with Love2D games...