A neat little experience and given how young you are, a pretty impressive effort!
I've provided feedback in the video itself but I'll also type here in
case you don't get round to watching. The main issues I find is in 3 areas, the fact it can chug a bit with no graphical options to make it easier to run, the sound and the checkpoints.
1-2 checkpoints will do the trick as I died (quite stupidly on my part admittedly) a few times on the parkour and chase section. It can be quite off putting for players when you take a wrong turn in a chase, die and need to go all the way to the start and do 3-4 tasks just to get back to the part you died.
Sounds is the main area I would say needs more, it's dead quiet 90% of the time. Some more atmospheric sounds and a bit more focus on the sound mixing/volume will do wonders on experiences such as this as building an atmosphere is more than dead silence followed by having my ear drums assaulted by super loud audio; Jump scares are great, but not every single sound needs to be as loud as one. Wind from outside, footsteps on the monster, dripping water around the pit, etc will really add to it and offer a gradual build up.
Overall a neat experience with much room to grow gameplay and story wise, hope you end up adding to it or at least use this as a base to make your future work more robust, you're still young and got a bunch of time to improve!