Really liked the minimalist style, the main character smooth jumping animation was great and the enemies, especially the final boss, where actually stylish. The music was nice, something calming and also melacholic at times, which fits. The game overall gave me some metroid/limbo vibes.
And as for a "negative" perhaps there could be more to the combat, since most enemies where more of an obstacle to run or jump by rather than fighting, also the lore was nice, but it would have been really cool to see what was described in the ending, maybe like an end screen art would be cool.
But overall, there is not much to critique, what you tried to make I believe was accomplished, so congrats on the entry, it's a short and complete metroidvania experience!
Also, nice map system! I wish I had remembered to put one on mine ¯\_(ツ)_/¯