It's just a Clank demo, but since playing as Clank is actually a big part of the game this time, that's alright. And it's even more alright because Clank is fun to play as now. He moves better, has a new triple boost jump, a time wand thing and bombs that slow down time for a while, and there's puzzles where you have to work with your past selves to solve stuff. Like you record your actions, then play it back so there's another you running around doing what you just did, while you run around and do other stuff that needs to be done.
In the demo it was basically just opening doors, but it was still fun. The door only opens when you stand on a switch, so you record yourself going to stand on the switch, and then play it back so a past you opens the door so that you can go through it.