Really solid entry! The weakest part is the graphics, there is no consistency, but I think the music and sound were okay.
But other than that, it had everything I expect from a metroidvania, plenty of upgrades and reasons to go back and use it for exploration, a decently sized map, good enemy variety. I think with a bit more polish in gameplay (some jumping values, feedback on actions, and some enemy balancing) it could be really great!