When I go too far left or right, there's a wall. When I press the up or down arrow, the character turns but won't move. I'm on web
I've tried the game on web and there don't seem to be any problems for me?
Here's a video of what should happen.
I'm very sorry to say, but I have no idea how to help you... There are some Let's Plays of the game on YT, if you're still interested in knowing the ending TvT