The game was too short and and couldn't understand most of what was happening on the screen. Controls were good enough and simple but the camera was really clunky and used to move ahead of my character when I was falling which was really annoying. Couldn't understand that the text at the start was actually a kinda of a cutscene until I started pressing buttons randomly until I pressed ESC and it skipped it (add some text to indicate that next time like "Press ESC to skip"). There was no audio in the game (or maybe it was a problem from my end)? Animations were alright and graphics were simple enough but nothing too good (add a background next time to make the levels and overall game more interesting). When changing levels, the game just quickly jumped to the next scene with no animations, transition or any kind of warning and also when I died (add some transition or animation when those things happen to give a better understanding of what happened to the player like a "Game Over" and "Level Complete" or something like that). Enemies and other threats were too fast and, once again, when I got hurt, there was no visual feedback of that happening other than the health bar going down (again, use some animations or audio to indicate those events). You say it's an horror game but it's clearly lacking some horro aspects like ambience, sounds, and other elements to give more immersion and suspense to the player which I didn't have that much during my playthrough.
In general, the game can be improved a little bit, the graphics were good enough but missed some things, level design was simple and could use some more work, the theme wasn't really that original (it's just another horror game) and the game was lacking audio and some animations as well.
Anyways, as I usualy say, don't let these faults discourage you during the process of game development! We've all started here and it's perfectly normal to have these kind of mistakes at first, it's with them that we learn to improve and get even better!
Congratulations and good job on finishing and submiting your game!