If you are a fan of adventure games made during the ‘golden era’ of adventures (LucasFilm Games, Sierra), then stop reading and buy Thimbleweed Park immediately. You will find a lot of throwbacks to those old adventures.
If you’ve never played an adventure game before, then this might be a good opportunity to start doing so. This game is funny, entertaining and challenging. Puzzles are sometimes hard, but never unfair.
Even if you’re a skilled adventure game player, it will give you hours of fun (and challenge).
Go play it, it is definitely worth the time and the money.