interesting thing you've tried here
composition-wise, the main thing i've noticed is the key signature, or seemingly lack thereof. for most of the time, it seems like it's in B minor, but in the cello section, there's a C natural, and tbh, i don't really like it. having accidentals is fine, but it feels like this song just kinda uses whatever notes it wants, which is usually fine, but as a beginner, i'd recommend you avoid accidentals and stick to the key signature unless you truly believe it belongs (song artists often use accidentals for a sudden change of mood or pace, but doing this right takes much time to master). i should give praise where it's due however. the accidentals are used BEAUTIFULLY here at 0:53. the B -> A# -> B -> C# is amazing, and definitely one of the best uses of accidentals in the entire song
more on composition, there's a lot of dissonant chords, which, much like accidentals, are incredibly difficult to use, so i'd try to avoid them while you're getting started out
the drums are good, and definitely one of the best parts of the song, but the main thing that bugs me is the amount of high end on the kick. it makes it sound less like a kick and more like a click with a bunch of low end, which is not what you want for most scenarios. this problem can easily be fixed with an EQ tho
the piano part suffers the most from the composition issues imo. it's not all bad, like the 0:53 i pointed out earlier, but it often feels like it has no continuity and it just doesn't make sense. this isn't always a bad thing, but here it definitely is a bad thing
there are a lot of smaller nitpicks i have, but for now, focus on the problems i mentioned above. they'll REALLY help you in the future