The game is surprisingly addicting. Cosmetics do save, so if that is your thing to grind go for it! If on track you can easily hit end goal in 50-60 minutes tops.
Not really needed. If you do die, it just resets the game anyway. If you're on top of everything you can easily finish in an hour.
it should have no problems. It is not a graphically intense game.
For those wondering, the game runs great on Steam Deck! GE Proton to be used, of course. But no issues and it boots up nicely with controller support.