First platformer I've enjoyed in years.
Psychonauts is a very solidly built and designed game, with a very strong engine backing it up. The controls are very ergonomic, with hot buttons to select your psychic powers, and the traditional jump, attack, etc. A wide variety of psychic moves also helps you get into the game.
During the game, you'll wind up diving into a bunch of peoples' minds, and have to sort out their issues, emotional baggage, and assorted mental crap like that. The game does a very good job of working these things into regular gameplay, like emotional baggage is actually suitcases and such that you have to find tags for to relieve. Once you gain the ability to enter peoples' minds, it adds an illusion of free-roaming, like making you think you can just go into whoever's mind you want, but in the end, you have to visit them all anyway.
Psychonauts is a fun game to look at, though, with very trippy artwork in most of the minds. Inside each person's mind is their own little world that they live in, and they all vary greatly, from a neatly packed box, to a disco party, to a twisted, tangled, crazy stairs (family guy reference) kind of suberb. It's always wild to see which one you'll end up in next.
And I shouldn't have waited so long to mention this, but the voice actors are very good. Not the best I've ever heard, but outstanding nonetheless. They really rock at helping you feel like the story is real, and that you're part of it.
The length of the game is something that I feel needs work, but IMO, all platformers are too short (except maybe Super Mario 64). I beat Psychonauts in under 10 hours, and I just felt that there was so much more that could have and should have been done with the story. I played through the game twice, although I there wasn't really anything left to do the second time, and there are still plotholes aching at me, but the ending did definitely leave room for a sequel, so I'm certainly looking forward to that.
So, with the recent price drop to $29.99, Psychonauts is an outstanding buy if you're a platformer fan. If you're like me, and don't really get into the genre much, it's a decent-good buy and a great rental, although I bought it myself.