I'm currently making a project with an icon that follows your cursor. Can anyone show me how to let the icon bump into walls while still trying to follow the cursor?

I'm not sure. Could yu provide a link to the project? I might be able to help then. Otherwise, maybe try adding a kind of a script to stop movement when it touches the color of a wall.

Make it so in each frame, instead of teleporting to the mouse, it slowly moves (but in a single frame!!! use custom blocks!) through and if it touches a wall the follow ends