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!