Played it for a while, I really liked the concept. Particularly, I hope to see the time needed for every "instruction" (that, I've seen, you've already differenciated between blocks) become more significative, it would be cool to have to worry about it too when ordering the blocks. Cool visual effects and animation in the menu.
Hope I'm not missing some crucial gameplay elements.
P.S.: Nice detail having the Scratch cat as the block shop seller!