Fun game, good job! Very original idea with lots of potential to be expanded upon like certain parts next to each other gaining additional bonuses.
I really like the pixel art and overall presentation.
On my first try I died at the end of the last wave so I suppose it isn't that hard, but I think it would be better if our hitbox would be just the middle part and taking damage would destroy the parts either way. Now you can't reliably dodge the bullets when your hitbox is so big.