Maybe you will find this interesting or it will give you some ideas: Awesome Slam Siblings - A Smash Bros tribute on the Commodore 64
Keep up the good work!
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Wow, that's a super impressive project! Congratz, I hope you will keep working on it ;)
Note about your take on AI, as people on the internet want to try a game before bringing it to parties, a very dumb AI is way better that no AI.
My first AI was as dumb as : always push the stick toward the opponent, and if close push the attack button. It really made it playable by curious people out there.
The current AI is a little bit more evolved, but nothing super smart, and some people have real fun against it. A bit long to explain here, you can find the github project and I guess you are familiare enough with 6502 asm to understand it 🧐
Anyways, you have better things to do before. Just don't say "never" to AI, they are useful and a lot of fun to program ;)