Use the arrow keys to move on computer, and just tap the screen to move on mobile. Press "m" to mute (Sorry mobile players). Sorry for it being so short this is my third platformer I've ever made (first scrolling one), and I spent a lot of time making the course look good.
Big, BIG thanks to @griffpatch for his tutorials on YouTube, they helped a lot in making the project, because I don't think I could have made it without his help.