I really love the game and I have some ideas I think you'll like.
1. Character endings: Please add character endings. I want to know what happens to the characters after winning arcade mode.
2. Tom's Tail Injection Pump Finisher: I love Tom's move sets and love to see more of him. That's why I think it be cool that, when you use Tom's Tail Injection Pump as a finishing attack, the character he uses it on remains in that fattened up state. It would make Tom feel more unique and it would be more interesting see each characters reaction to remaining fattened up.
3. Add Taweret is a fighter: We all know that Taweret is popular in the community as the goddess hippo of fertility. So it makes sense to add her, especially since she'll be the only character whose move sets would focus on fertility. Also, Taweret could have a special attack that has an effect on female characters, where if used as a finisher, it results in female character becoming pregnant and growing a large swollen belly.
There not bad ideas and I hope you can one day implement these ideas into your game.