lovely idea, cute puzzle game! I liked the mini game between levels - although some mana crystals are out of the viewport? perhaps a way to collect more would be to be able to move the camera around or something :)
I had an issue in one of the levels (one before last, I didn't get the name, which I guess doesn't help you if they are randomly selected!) where a yellow building wouldn't move into a gap even though it had space. I ended up running out of mana because each click counted as a movement but the building wasn't moving :(