I loved it
A lot of people here seem to be missing the point. I don't think it's meant to be colourful, or detailed, or have fancy textures.
And in my opinion, none of those things would contribute anything much to the game; it's fine as it is. My best score is 2546 - took me 6 attempts to get it! It's quite addictive.
And I enjoyed playing it, that's what counts. Good job!