Excellent Fan made game, but with a few drawbacks.
A great tribute, with levels, playability, and bosses that played just like they were out of the GBA. But, you had a few thing against you...
One, where is the blaster pistol? That would have made the game a little better.
Two, the enemy's shots do more damage than they did in the MMZ games.
Three, You might want to add an upgrade/cyber elf system that includes double jumps, more health, slash shots away, etc...
All in all, a very excellent game, but you could add those above in a sequal, considering you make one.