Couldn't brave the infinite wave, but I guess it's good because there are lots of game jam games to check out :)
I really like the difficulty curve, and the dynamics of having more than 3 slime types, but I wish I had more time to prepare for (spoiler alert) 5 different types of slimes!
One low hanging fruit I'd add to entice players to keep replaying is adding 'combo' score multiplier / bonus for popping 2 or more baloons in a row. It happened to me several times and it felt good - you should capitalize on that.
A great submission overall!
