This is a calm and peaceful game, with a simple optimization problem before you- sort these blocks using the limited space given to you. It doesn't try to be some grand adventure, it knows what it is, and it does what it does quite well. I feel like the gameplay is perhaps a little too free- you can stack any blocks on any other blocks, the only limit is four per tower.
(I suppose what I'm saying is that the typical form of this puzzle is the Towers of Hanoi, in which the blocks aren't colored but they are sized, and you can only place a block onto a tower if the tower is empty (base case) or the block(s) already there are larger than the block you are trying to place, (and your task is to move a stack of X blocks from tower 1 to tower 3, with the help of tower 2), or a, like, potion-mixing puzzle where you move groups of blocks from beaker to beaker, and you cannot separate a group once they have been mixed, and you still can't overfill any beakers so the puzzle is pretty strongly one-way and so a reset button is important to offer.)
But, for the puzzle that it is, it works well.
Okay, but there is one bug! If you use the up/down keys to move up/down a row and your cursor is empty, that works, but the height of the cursor isn't correctly adjusted! So if the tower you moved to doesn't have the same number of blocks as the tower you moved from, you can't actually access that tower. This shouldn't be hard to fix, since left and right correctly assign the cursor's height, and even in-game I fix this by also tapping left and then right whenever I tap up or down, so I'll do "up-left-right" or "down-left-right" and it has the same effect but also corrects the cursor's position.