Robeez: I got to try your game at GDC. I am not sure if you have improved the game much since then, but I had some critical feedback for you. Take it or leave it...
1. The art is top notch, especially if you haven't been making games for very long.
2. The basic actions in the game are a bit bland. By the middle of the first area, I was pretty bored with the few options I had to beat up my enemies. I would suggest really playing a lot of beatemups and seeing how they give the player more options than the basic punch combo and jump kick. I know the "old classics" got away with that, but 20 years of evolution have improved the genre and increased player expectations.
3. Enemy AI is decent. You have the basics down. But you need more variety in what enemies can do to the player. You need to make sure each new enemy type has a unique role when they are onscreen. Being able to make interesting situations by mixing and matching enemies is the bread and butter of the genre.
4. The main player attack animations don't feel like they really connect. It just feels like the player is waving a laser in front of them and the enemies nearby appear to be hit in the stomach. There is no feeling that the player is actually making contact. A huge fix for this would be to get good hit sounds. But one thing I was told when working at Capcom (by old school beatemup designers) was that it is more important to get the enemy reactions right. Player action is secondary to enemy reaction when making you feel the impact of a hit.
I hope this doesn't discourage you, but helps you improve your game. Good luck!