It's nice that you undertook a creation of a platformer! However I think your game doesn't do many things that make platformers good quite right. Consider watching this video to learn how to make platformers that feel amazing to play because there are a lot of tricks to learn there: https://youtu.be/yorTG9at90g.
There's also a really good talk on how to make specifically good jumps, that's also a good starting point: https://youtu.be/hG9SzQxaCm8?si=snCd7RvTkLzRnzgk
Or you could search tutorials specifically for Unity on how to implement good platformer mechanics.
Best of luck on your gamedev journey!