I want to make a scrolling platformer, but the issue is the wall detection doesn't work. It seems to for some reason whenever it touches a wall, go straight up it instantly. Even though I added slope and I made it repeat until it's not touching or slope = -8 it still doesn't fix it. Here is the link to the project: https://scratch.mit.edu/projects/413081043/

I can't actually move in it.

It's W A S D to move.

I believe the problem may be that the wall is the same sprite as the floor, so when it's touching the wall, it goes up

change y by ((([abs v] of (Y Velocity)) / (Y Velocity)) * (-1)) //Which I THINK this makes it go up.

so it ends up at the top.

change y by ((([abs v] of (Y Velocity)) / (Y Velocity)) * (-1)) //Tell me if this doesn't make it go up.
//Because the value of
((([abs v] of (Y Velocity)) / (Y Velocity)) * (-1))

//is one.

Then how would I add proper wall detection while keeping that in?

Add a different sprite for the wall.

But I want the level to be all in one sprite.

You used some bad practices but anyways here I fixed it.

My suggestion, don't use booleans as 1s and 0s, I used to do that 3 years ago, made it annoying to find problems.
The method I used to fix it is just a regular platformer script but it cancels out x velocity in the end and instead adds it to Scroll X

That wasn't me, I actually used the script from Professor Blue, because I'm pretty bad at making platformers. But thank you anyways.I changed a bit around, and I realized that the repeat until was halting the script for some reason. I didn't know how to fix it.