The instructions are in the game. All levels are 100% possible both on computer and mobile. WARNING: It might lag a lot beginning... and sometimes a strange drag appears to the player so to fix that just press the up arrow key and the left/right arrow key. And the portal in the end doesn't do anything, just sends you back to the start.
Thanks to @griffpatch for Griffpatch's Scrolling platformer on Youtube: https://youtu.be/sebnyhBsXug (for part one). And also: https://scratch.mit.edu/projects/270939991 for the costumes/sprites. I added my own bits too.
