I think this just a me problem but when I use my Xbox controller I am able to navigate the menu fine but when I enter the game itself the only thing I can do is move and sometimes after refreshing the page it allows me to jump but I'm not gonna get too critical since this is a prototype after all.
Aside from that little hiccup this looks extremely promising, the sprite work alone got me hooked into looking at it more and I gotta say I'm in love with it's artstyle! The opening was pretty neat too and it certainly gives off a retro vibe but for a modern age (not really my thing personally since I love a full on retro look myself) which will certainly make it stand out from other beat em up like games that go for a similar aesthetic. Genuinely cannot wait to see how the finished product ends up being! Good luck!