First of all - WOW! You made so much content in such a short amount of time, and it's all good! Incredibly impressive!
This submission (and I bet you got this a lot) seems to be heavily inspired by Undertale (and Toby Fox in general), and I love it! Great music, with some really solid uses of themes and leitmotifs, which is always fun to hear! The production also sounds very Toby Fox-y, with the types of instruments and effects you use.
I'd like to add that my personal favorite track is Cave of Dreams, 'cause I'm such a sucker for good ambient tracks. I also really enjoyed how A Place Mysteriously Located In A Far Side Of The Cave is similar yet still different from Cave of Dreams (that name is also very Undertale-y haha)! There are a ton of details I liked about this OST, and I could really go on forever, but we'd be here all day.
Great work! Can't wait to hear what you'll do next!