Nobody really knows why this game is good. It's written down on a scroll somewhere. It's a platformer in an ocean of platformers. It's sweet and pretty, it's enough and not too much, it's easy on Normal and sometimes annoying on Normal, cos who enjoys falling to their death repeatedly? But that's the genre.
Get into the swing of things using Thief; mow down skeletons using a bow with up to three arrows in one shot. If she's dead for some reason, choose the knight to mow down even more skeletons. If these classes fail, use the Wizard to get to the next checkpoint. You can even fly Aladdin-style using two conjured planks on top of one another, once you turn on levitation. Leviosaaa, baby!
I haven't tried co-op and I've yet to play the game on Hard mode, but I'm 4 achievements shy of 100%, so I felt comfortable enough to share my thoughts. Finland has some great developers, so I feel good about supporting them. I rate this game "Ihan mahtava, peukalot pystyyn!"