3.5/5 Enjoyment - I enjoyed my time with this one alright. It wasn't 100% enjoyable but (despite some issues mentioned below) not overly frustrating, and I didn't feel like my time was wasted at any point, at least, not particularly so for a jam game. I bumped this up to 4 in the scoring.

3/5 Execution - The jump feels wrong to me. I can't tell you why. I think it goes beyond my anti-WASD+spacebar biases, though. The most concrete thing I can say is, I feel like I'm uncertain what I'm able to do with it, and not in the easy-to-learn-hard-to-master way.

3/5 Visuals - The visuals here aren't absolutely stellar, but they are is pleasant to look at and inoffensive, and they mostly convey what the game is about.

2/5 Audio - There's 1 track here and it's honestly not super-fitting to the setting, that I can tell.

2/5 Metroidvania - This gets a point for being a platformer with some exploration aspect which I could readily see expanding into something more genre-fitting if it were extended. As it stands though, with neither literal nor figurative keys and doors involved, I think 2/5 is appropriate.

Nice, a decently well thought out experience. The art and music work well to create a unique environment. 

As others have mentioned, it's not technically a Metroidvania. You could add more keys, and require the player to unlock certain abilities to get them (ex: double jump).  

It would be nice to have some sfx to go along with the jumping and shooting.

Nice job! 

Lovely visuals! Was enjoyable to play if a bit simple - at first I didn't like that the key progress didn't save until I got all 3 and realised that was the whole game!

Really enjoyed the music, but didn't get much of a Metroidvania vibe at all unfortunately.