This is a great idea. I've dabbled in auto-battlers and this is a compelling one.
The artwork looks interesting, but there's a lack of juice. The punches and kicks feel weak. You're kinda just sitting there watching the whole fight while doing nothing. All attacks are identical. It's the same failing animation, the same basic sound effect, the same standard health bar. I think people will want some spectacle when they're just watching. Other jam games use different visual and sound effects to enhance juiciness. Without this, watching these fights can just feel repetitive.
The items lack descriptions and even any stats. This makes every decision random, as it's difficult to discern what an item does during combat.
You go into each fight without replenished health and there are no health packs, which doesn't seem fair. So, you eventually lose even if you play well.
This game is definitely a great start. But your main problem is what do players do during fights.
I hope this helps.