I’d like to use stuff from that project and put it into my own game. Can I do this?
Yes, you can use any assets from Unity demos however you like, as long as it’s in a Unity project.
No, if you look through the documentation of pretty much any tutorial or example files made by Unity associated teams, Terms of Use say strictly non-commercial. Also, if you reuse or plan to distribute, it’s normal for you to have to attribute work to the originating author even if it’s not profit based.
ok great and i plan to use assets from it and make a new game.
Are you planning on releasing the game and selling it? If so, no.