great game! i love how you incorporated the limitation to your game. it made for a fun, unpredictable mechanic :) i agree with ximer on the sprites, the fuzziness was hurting my eyes a little; when you import a pixel sprite to unity, you need to click on the sprite in the project window, then in the inspector switch the filter mode from the default "bilinear" to "point". that prevents unity from trying to smooth out the image, so it should fix that nicely for you :) aside from that, your mechanics were great and i found  myself playing a few times just to beat my score. great job!

Set sprites filter to nearest pls