oh man that boss was difficult
i am glad to see that you did your first game jam learning all by yourself, the game has its own style which personally i found appealing. however, there was multiple times where I got stuck inside the platforms, unable to move
i love the idea of combining this survival horroresque thing with platformer. personally enjoying more the former than the latter, I like to see aspects of this game such as recharging the weapon and getting ammo, that makes the game more interesting. Also like you put variety in weapon options.
If you would like to expand this game, I think it would be a great idea to add some variety to enemies and fix the wall collisions.
Salute