I like the art a lot, though I do feel like it's missing some background music. It's also a pretty good concept, a Lemmings-style game where you have to guide a cat around, but ironically enough the game itself is like herding cats around - impossible and frustrating.
I couldn't get past the second level because of two main issues - First of all the up arrow is buggy and inconsistent. Both unintended strategy of launching up the cat and the presumably intended strategy of making staircases fail because the up arrow doesn't work half the time.
Secondly the UI doesn't really work all that well. It's impossible to deselect a block after you've already selected it, so you just end up wasting them by placing them in a random location. It's also impossible to move the camera while holding a block, so you waste them by trying to move up as well. You also can't undo or erase blocks, which is a necessity in these kinds of games.
I know you want the player to "rage and be frustrated" but this isn't the kind of rage and frustration that makes you want to see more of the game. This is the kind of rage and frustration that makes you want to not play the game anymore.
It's still quite a solid game, but it needs more polish to be playable.