The guy is your player. Use the arrow keys to move (and a secret key, found at Levels 1, 3, and 4). Don't touch dark red. Touch the check mark to move on to the next level, or if you're at Level 4, end the game.
If the star appears to be on the top path of the first level when you try to restart playing, please press the green flag again. My apologies, I don't know how to fix this bug. Please love, favorite, and remix if you want (with credit, even though I know credit is on top of the instructions of your remixed project, also credit me in notes and credits if you used your backpack) It helps me a lot and makes me want to update this platformer more often.