I played this game solo, and found it worked well then. I can imagine the game is even more fun with two people!
The controls are just the right amount of whacky. It feels really good when you do a big buoy stroke and go really fast but I feel like the game tries to force you away from that with the collisions and small playable stage. Perhaps some stages might be a bit bigger so that I could really let it rip.
Trying to control the dingy when the air pressure was reducing was a lot of fun too. Great work!