PLEASE buff Pump Punk she is so awful to play as.
She's the only character that can't dodge and attack at the same time, and that makes her unviable at later waves. She either needs better offense (Better AoE on enemy kill ideally) or to have her defensive ability changed (Charge on pump, hurtbox shrink when pumping, have pump be an asynchronous ability where she can still move while doing it) because she just can't handle the amount of projectiles that come her way. She can't kill enemies fast enough at any size to get enough meter to use her inhale, and her expansion doesn't help her offence enough because her time to kill is still so egregiously long that she will die before she can pop a cake.
As she is now she needs to stand completely still for 4+ seconds at small size to pop reinforced cakes, or around 3 seconds at large size. That isn't possible. So she just chips her damage around while not actually getting any kills, so she isn't making the enemy forces weaker.
She's in need of so much help. She is definitively the worst character in the game by far. She's just worse Phoebe, and Phoebe's already not the greatest. But at least Phoebe can weaken the enemy while she dodges.