Scratch Final: Part I

I would like to create a game similar to the popular app Flappy Bird. However instead of a bird it will be a fish swimming underwater avoiding blocks. I will use a fish sprite and an underwater background. To win you will pass all of the blocks without hitting any. There won't be levels but the fish will start going faster as you progress. To simulate the fish moving faster I will make the blocks glide quicker while the fish stays where it is.