This is awesome! I'm in love with the art and sfx style. I think the difficulty curve might be a little sharp especially between levels 1-2. (i nearly beat level 3 but couldn't quite manage) (and i am aware that i can't say anything regarding difficulty with what i submitted). As a minor thing at first i thought the sign in level 0 was some sort of extendable platform, maybe it should be a sort of light grey tone to help indicate it's not a solid part of the environment?
But yeah i agree with everyone else this is peak well done