So after giving the game a few rounds, it's an overall fun thing, specially for an inflation game since there's not many good ones. I do have a few comments I'd like to make though.
1: I fail to see why there should be the various expansions as damage types mechanically, I love the flavor of them that beating someone with a damage type gives different victory text, but mechanically I think it's a flop for this game since all I've noticed is that it's a weakness mechanic and certain characters are weak and strong to certain types of damage. The problem is that, other then the rng of the game, it fully means that not getting certain weapons just kneecaps an entire experience. Like if I encounter Roxanne and don't have what she's weak to and running fails the player is outright screwed against her in my experiences. I'd say either scrap the weakness stuff and just keep it as flavor, or potentially allow the player to equip 1 of each weapon type just to make it mildly easier.
2: the attack bonus needs some explanation I feel. The bubble bazooka has a -2 attack bonus I saw, but it does damage upwards to 50 points even against things it's not strong against, but then there's the pooltoy claws which have an attack bonus of 5 but feels like they do almost nothing at times even against things that say "super effective", or the balloon boomstick with a 4 but it feels like it does more damage than it should against everyone.
3: Potentially some general rebalancing of a few characters. This one is probably more just personal preference, especially since I haven't been able to encounter everyone and I'm eager to see the 1v1 mode implemented for this, but I feel some characters should maybe get an hp nerf, like Jess for instance and her 300 hp; like how do I even begin to deal with a character who has roughly 3 times as much hp as everyone else and strips 2 points of armor off of you every time she uses her special. like how do you beat that without the prize pump? maybe I just didn't use what she's weak against but like... 300 hp is not an insignificant amount in this.
Other than that I've enjoyed the game and I've enjoyed your previous projects as well, certainly looking forward to some of the planned updates to this and hope you continue to do more things in the future.