This is a problem I'm really unsure how to fix. On my computer, the game works fine, but I noticed that when other people play it on their devices, that the player moves considerably slower than intended. It may have to do with my bad laptop, but I really don't know how to change it. With the wall, you're meant to jump off it to get higher, which is done by holding the W key and jumping off the wall. I thought this might have been easier to figure out than it turns out to be.