A note about my judging: My rating scale starts at a baseline 3/5, anything good done raises a score, things that are less good can lower a score. Genre is rated generously. As a game-developer I know that when giving feedback, while I can give suggestions, it's up to you as the developer to determine what accords with your vision.
2/5 Enjoyment: The experience overall is competent but not necessarily engaging. I would recommend redesigning with smaller rooms, which will make more packed rooms feel more action-packed and more empty rooms feel more atmospheric and less needlessly big.
It was unclear what the switches were doing past the first room.
Hitting a checkpoint for the first time should restore health.
Big bosses should not insta-respawn you even if it's lore-appropriate, excepting the wall of salt.
2/5 Execution: I came back to the game after playing a bit on my lunch and lost the save to a respawn within a wall, which R did not appear to fix. The switch levels should be re-thought. After defeating the wall of salt I appear to be either soft-locked, or locked behind a jump that is simply too difficult for me to make. I recommend more thorough playtesting in the future and ensuring that you and another person of lower skill level can finish the game, and if you provide a save system, make sure no save-points have the same problem described above. Other small technical or gameplay execution issues such as getting stuck a wall so as to force a respawn.
2/5 Sensory: Music is there and a sound effect or two are there, but the effects aren't there for everything--even everything the player does. Visuals are serviceable and generally communicative which is most important for a game, and the main character and bosses have some charm to them, but the visuals are not 100% on point.
Re music, I gather it was probably original, so I tread a bit lightly here: I recommend putting more effort into it with the next game, even if it means sourcing from a public domain or creative commons source, or going without.
4/5 Metroidvania: This hits the basic boxes for the genre, solid effort there.
A solid effort all-around, but needs more polish to shine.
