For a new developer, this is a pretty nice game! There are a few issues with the jumping where on thin platforms  it sometimes does not register your jump input, but otherwise it's a fairly fun platformer. I did get startled by the voice recording you put on one of the levels, hahaha! 
I highly recommend you set up a GitHub for your projects though, that way if you lose your data or somehow something goes terribly wrong and you don't know how to fix it, you'll have backups to restore your projects. Using it is also mostly simple, looking up a few tutorials should give you the basics!

Good luck on your future projects!

Okay this would be good for a first game actually. I suspect you used pre-made assets for everything in the game, which is a little disappointing. Unfortunately there is no GitHub repository attached either, which further lowers my rating. I also think that you might have just made a Roblox-style Obby game and then just added the wave "mechanic" at the end to make it fit the theme. Overall, disappointing entry and I do see the potential. You could make this a lot better with just a few simple additions. Don't be discouraged! A few issues: the raycast for groundcheck is painfully precise, and the thin platforms often make it bug out and not allow the player to jump. Consider adding Coyote time or a more expansive groundcheck.