Cool experience! I think the assets and sprites complemented each other really well for a survival horror game and it's pieced together excellently. Monochrome is perfect with the dimly-lit interiors. The enemies that skulk out of the dark and only show their true colours when agitated by a weapon is a fun horror behaviour. Their hitboxes can be a little tricky if positioned right over the player given the directional nature of attacks, I think. Having quite a close-up perspective draws more attention to the interesting environmental sprites, but it does mean it's easy to get lost in the eerie bowels of this creepy facility.
Congrats on making a first game!