Really interesting concept, a puzzler bullethell.
Played the whole thing, including the secret boss. Managed to get through without looking at the walkthrough, so i'd say the difficulty is pretty manageable from a puzzle/sequence design perspective. Might be a tad bit hard for those new to bullethells though.
Varied bullet and ship types keeps players looking forward to the next upgrade in their body hopping. Feels pretty fleshed out and complete, would totally play more levels of this, though maintaining the novelty might be rather difficult. Look forward to further iterations of this idea if you plan on doing it!
The overall aesthetic is real great, and the music is a banger. A little sound effect for when the dodge bar is refilled would be great tho. Hard to look away from the bullets to check.