The instructions are in the game. Just click on the 'How to play' tab, and you will see it. also, this game is pretty big and really buggy, so don't mess around with the programming unless you know how to fix it.
This is a port of a gameboy game that I made 2 years ago, and i'm pretty pround of what there is to it. It's really buggy, but like I said, I made it 2 years ago, when I had less experience with scratch.