Totally awesome game!!! I love this. I've played thousands of games in my whole life and these games are what I like most:
Easy to play and access & Innovative!
The concept is easy. Two guys made of springs are battling it out. As they are flying around, you can steer them with W,A,S,D or Arrow keys. 2 player mode, of course.
It's going to be a buy. Cool one!
The sounds could benefit of having some unique sound effects for the different kinds of blows, i.e. head kick, chest blow, etc. Also some interactive soundtrack that alters according to the health bars would be cool.
Perhaps being able to do something would be cool. Maybe before the match, being able to choose between some special skills, for instance you could perhaps choose kicking, or sword, or having a gluey slime rope that you're able to swing yourself around with? Just some suggestions.
I must say that it has that really beautiful 80's C64/Atari aesthetic touch to it also. Good job!
As for the graphics, I would give it a 4 or 5, but since the sound is a little sparse, I'm giving it a 3 there.