Cute little game! ^^ If there is an end I cant make it haha, same reason you already discussed here I think the air bubbles don't replenish enough oxygen imo, but if its just to survive as long as possible then its fine! great game :)

I'm not sure if the collision detection was triggering the bubbles to give me more air because I wasn't seeming to gain anything on the blue bar when I bumped them so I didn't make it far, but I like the character's design :) 

Also, I approve of using Python for game jams -- I used it for my submission as well :)

I like that you can edit the map