Wow really nice game with really nice executions. It looks amazing, there is tons of finely tunes details like the sand, physics objects etc. The music is chills and the sound effect really punchy. Really nicely done.
The level design really sold the game to me. Each now level was a small puzzle/challenge to figure out. These bit size gameplay bit create a really nice pacing in the game.
For a bullet hell however there is not so much bullet :) (well except at the final boss which I skipped... way too difficult) The bullets are sometimes difficult to see (in some levels with more geometry and in general a bit difficult to dodge.
Also the screenshake was turned up to eleven.
Really nice submission