Would be good as a mobile game, just add a little music, get a public domain backdrop, and maybe decrease the speed at which the block moves back and forth because as of now it's really annoying to get it to fall where I want it to. I also agree with LDeins, the gameplay is rather repetitive without a clear objective besides getting a high score. Maybe do something Ketchapp does with most of their games and make objectives, different gamemodes, unlockable skins, etc.

Game seems to work, but it's not "fun" at all. Sorry. No real goal, just a high score. And the gameplay doesn't change at all over time. So, it's pretty boring in my mind.