Not bad, I liked how the main character is done with all his animations and stuff, seems to be pretty polished.
I would say you don't really need to use the drill mode, like I mainly used it to get up on the terrain on 1st boss. Then second boss is missing that mechanic from what I understand, and for 3rd one you just need double jump and dash. So would be better to see some encouragement to use it, like perhaps during drilling you could get some kind of drill power to use powerful attacks or just to get bonus damage on attacks. Also 3rd boss seemed a bit too easy, you can just skip all the enemies, attack the generator and jump on boss, and repeat 3 times.