Interesting, but a little rough, aesthetic. Very nice explosions, feels like they've been lifted from Metal Slug game. Managed to beat the main boss, the laser beam should be telegraphed a little better. Other than that scrolling was a little sluggish, game wasn't dynamic enough because of that ( I think). Long beam takes a litle time to travel to end of the screen but when I stop shooting it then it disappears instantly. Very odd.
Very detailed backgrounds, I can't imagine how much work went into them and animations of enemies. Shumps can be pretty demanding for artists, I hope you have a lot of perserverance. Keep up the good work!