Max: The Curse of Brotherhood is essentially a puzzle platformer with some brief precision platforming sections.
It's got great cartoonish animated visuals, but don't let that make you think this is a children's game.
It starts off easy enough, but towards the end of world 2 I can feel it getting tougher. I've played the game for about 2 hours now and am about 25% in, with exploring the areas and getting most collectively. Can't speak about the overall length or difficulty for now as such.
The platforming is really slick though. Max is agile and moves quickly. This is something I really like about the game.
The puzzle element meanwhile is novel for me. Your magic marker gains new powers, and you can draw vines, branches, pull up earth from the ground etc. initially they may be very direct since there are visual cues but as you go on there is some thinking required.
So far, there is one notable performance issue. The game occasionally has it's frame rate set to 15 or 20fps and I need to Alt Tab out and back into the game to get 60fps. Nothing major and this usually happens only after loading screens, and that too not always.
Overall, I'm enjoying the game. Nothing out of the world extraordinary, but slow paced and well made.