Press the green flag to start. Use the cursor keys to move. I would recommend Fullscreen. It has 4 levels, and all of them are super easy. Yes, I know it's short :)
Thanks @Eintity for the snow animation: https://scratch.mit.edu/projects/12614834 My First platformer. Hope you like it! :) Fact - This is the one of the very few triangle platformers in Scratch!