Nice animation, but...
What really kills Theia is that there seems to be a lack of spacial sense. It isn't clear where the boulders can and can't be pushed to, and that you need to need to stand in a particular position to push them just adds to the pain.
There's also the matter of collision detection when concerning the static environment. In one level in particular, where you have to "run the gauntlet" between the rows of the orange Bubba, it at first appears that that you just simply go straight down to the goal. And yet, when you do, you are instead blocked by the invisible corners of the crystals that really shouldn't stop you.
The pacing of the game is incredibly slow. The character you control moves very slowly (especially through the sandy segments), and the burrowing animation takes way too long. I'm not asking for Sonic-style gameplay here, but considering that this is supposed to be an action/puzzle game, playing as someone who's almost sauntering around is excruciating.
I actually like the premise here, and the overall look of the game is very good. It's a pity that it can't be enjoyed like you probably wanted.