I'm no fan of puzzle platformers. All the walking back and forth, collecting crystals isn't my type of game, I guess. Plus it feels like it's aimed at a younger demographic. So it's easier to point out things I didn't like
I played the first and part of the second level. Overall it felt too slow and the atmosphere wasn't captivating enough.
The launcher is confusing. In my opinion it lacks structure and the standard UI elements make it look old-fashioned. Took me some time to start the first level.
Gameplay felt slow and the graphics look a bit dull/colourless. Maybe a few special effects/animations (e.g. animals walking/flying around), dynamic lighting and a background (clouds, a world below, etc) would help. Textures look good but graphics in general lack something; don't know what exactly, it's all too static. No offense, but the death-animation (when you fall down a platform) is a real shock. It looks horrible and doesn't live up to the quality of the rest of the graphics :D. Also music would have been nice. Overall it's a solid base that lacks polish in my opinion.
It's probably nice if you like this kind of game. Compared to most of the "collect gems and push buttons" platformers it's good, but I'm no friend of the genre.