Maybe you give better instructions for your game. I played it and it was too hard for me! But i think it could be a good game with some work.

The controls are interesting, but the way the game works now, there's no reason to ever drop a sheep anywhere but the furthest left in a row, right?

I like the art, and I think the movement scheme is interesting. There just isn't much of a reason for you to have the sheep following the retical versus just having the arrows jump between rows, you know? Maybe if pickups appeared on other squares than the top right or something like that?

Maybe some kind of rock-paper-scissors pattern to this game? Now it's pretty mechanical - you just collect sheeps at top right corner and put each one on every line in the farther left. It wold be good if different zombies would have difference so you have to plan your strategy. Like in any other tower defence game.