This is a really good idea and i love the world generation, but there are a few things i would recommend you to do:
1. Make the speed the same in both levels
2. Make the camera better
3. Make the music loop longer
4. Someitmes you could see through walls and textures where glitching
5. Give the player hints or something that they can find the sword more easily.
6. Don't use the standard Unity font. There are great ones on sites like Google Fonts. Also, use text mesh pro.
I hope my feedback helped you a bit. Keep making games and you will get better and better. Check out my game too if you have time. Thanks :)