First i want to note, that you did a great job this far imo.
But still i have some improvements on my mind to get more mega man feeling in the game, but i dont know if skulltag is able to even do this.
-Jump height
mega man can jump really high and so should you be able to in this game, perhaps not as high as in 2d mega man, but at least twice as high as is now
- slide and crouch
you should add megamans slide ability but i doubt it is possible in skulltag. but if its possbile it would be great to be able to slide into enemys and beeing able to do some damage this way. at the same time you should disable the ability to crouch, since megaman cant do that :-)
- level hazzards
i like the metal man stage the most since it got those neat conveyor belts and i think you should add more hazzards like spikes, flying scissors etc. and if possible the vanishing platforms.
i think those things would drasticly improve the megaman feeling of the game, but still im aware most things might not be possible on skulltag.