Nice

Needs improvement but good job

Needs to be fixed

Graphics need improvement, the background should be matching the platform styles.
When you shoot and the projectile hits fire or an enemy you lose health you should make it a different MC instead of being part of the character, the collision between objects should be more accurate, a mute button as always never hurts and you can walk inside the platform

Before you release the series...

Youre going to fix it up a little, right? Cuz i see a lot of promise in this.

I can honestly say..

This would make an amazing full game. Just some reccomended improvements, like for instance, maybe you can add a few new guns? Power ups? More obstacles? I can't wait for the full game. If it is nearly as good as the demo you can count on a 5 from me on the full version.