I agree that balance is one of the biggest issues for sure... I was afraid it would be way too easy, and maybe it is. But on the other hand, I watched it streamed on discord, and that player struggled quite a bit at times, with many defeats. It may depend on one's experience with the genre. I definitely agree that more variety/strengths/weakness could help a lot... I had some ideas I wanted to add, but the end boss mechanic was the only one that made it in. I was afraid of introducing bugs in the 11th hour and played it safe...
Speed is something I could definitely consider changing. I guess I defaulted to "fast paced" because it's a jam game, but so far it does seem like a slower pace might be welcome. Probably wouldn't be hard to implement either.
I'll consider your thoughts on the theming as well, though I make no promises haha... at the very least, 2Goku will probably be an action-fantasy lark.
Thanks so much for playing, and all your helpful feedback!