This is much better than I expected. A welcome change to the 2D and clearly the devs went back to 2D for the next 2 games in the series. It's not as good as 1 and 2 (which I've played recently) but I loved it actually!

Alright, first off I did very much enjoy my time with this. It's very pretty like all the game in this series. It made me smile more often than not. And it's unique out of all the Trine games. Being able to freely move in 3D does make it feel like it's own thing, and gives you a very alternative experience compared to the others. The Dev's really wanted to do something more and different with this one, it shows and I honestly commend them for doing that.

That being said. It being in 3D can and dose work again it in some ways. Judging distance and other spacial awareness issues can lead to frustration with platforming and some combat encounters. And with 2 other players, you can end up loosing track of were you are in the more intense parts, leading to you dying and you not being sure how.
The physics can also be a bit jank at times, but honestly I found them more funny then annoying so it's not a detriment.
The End Boss boss can go %&*$#@!#$#$%&#@!& though. XD

So, overall its a fun little game. Full of charm and does it's own thing. Though it does show that Trine is defiantly a game series that plays best in 2D. That is were it shines brightest. Plus it's not a long game which I think works in it's favour here.
I say give it a go. It's different, and personally I love it for that.

Glitchy nightmare don't do it!