The game’s a really nice surprise, and very competent for a first time! It’s my favourite of those I’ve tried at the moment. It feels fairly complete, which makes some little rough corners pop out more (small stuff like meter not regen on training restart) but the idea is pretty clear, and it has real soul.
I think stamina is an interesting mechanic and alternative win condition, I would suggest pushing more into it. At the moment, your stamina is feels p much out of your hands, and is fairly snowbally, so it mostly a way of ending the game early. The losing state is also hard to take advantage of: you only have a very small window of opportunity, due to the way it regenerates. This is your game’s unique mechanic, so having more moves playing into it would really make it shine, at the moment it’s a bit niche.
The character designs are cool and quite complete, I especially like Blitzer’s flow, between the kicks grabs and OTG. I think a couple tweaks to movement (stuff like jump height and dash speed) could make the game really shine, I hope you will continue it!