A unique game mechanic for sure. I'm a bit embarrassed at how long it took me to realize that I needed to keep the balloons on the screen instead of bouncing them away -- I misread the instructions, but thats on me (lol). I liked this game, but at the same time it does feel a bit too reliant on RNG. Sometimes I'd have a balloon spawn outside of any pegs, and watch as it just drifts away.
... but on the flip side, a balloon also spawned within a tiny triangle I made, bounced around incredibly fast, and this happened.
While an impressive score for a 20-second round, I don't really feel like I earned it moreso than cheesed the RNG. Other than that, this game makes for an interesting arcade-y get-the-highest-score type game. Reading some other comments, I'd say you nailed it with creating that highscore chasing feeling within your game. I think with that, a leaderboard of the player's best plays would be a nice addition.
Good jam entry though!