A hovering visual effect for the buttons would be nice.
We need music and more sound effects.
The card gameplay is too slow, make it way faster and more flashy, use sound effects to emphasize the damage and make the numbers go red and down, make the player feel like their life depends on winning the card game. You can also make the character shake, or maybe even make the screenshake if you lose too much hp.
We need to feed the angle some hamburger, she is too skinny and weak.
Cool art, but I noticed that the quality of it is better for the cover image and the cards.
I unlocked two lewd image by winning.
For the game design aspect... It's too simple, so there's not much to talk about it, I guess I would add skills that you can use a limit ammount of times so it's not just pure luck, and each character can have their own, and maybe unlock the skill of the character you beat.
You worked really hard and developed a lot of games, keep up the good work!