Very polished, nice mechanics, especially the corpse/shadow. Suits me well because I'm terrible at platform games (even though my game is also a platform game haha), I did have to give up on the level with the helicopter platforms. After leaving 20 corpses, finally getting to the last platform and hitting a wall, I gave up. Blowing up the 20 corpses was hilarious though. I liked the falling boxes too, its not something I expected in a pixel art platformer.
I did find the sound was a little loud, especially the "speech" sound effect but obviously I'd be surprised if anyone had time to add volume controls to their game!