I Love this! I've made a 3D maze like this on a different website. But I found a bug, when you look at a wall that's right in front of you it looks like it's moving backwards even though it's a straight wall. you can fix this by using cosine and finding out the angle

Thanks a lot! I know what you mean with the effect, and I know how to remove the bending. However, this causes the walls on the sides to not look straight anymore, and I found this to be less annoying that the wavy side walls.

However feel free to try and fix it, I would very much appreciate it! I had exactly this problem now several times, and I can't figure out how to get rid of it.

May be you should change the controls. The combination for rotation and moving is quite weird. For me the W and S should be for moving and A and D should be for rotation

Oh I see. Online, yes performance is always bad. But offline Greenfoot has a very small performance penalty. The main way of optimizing this is to improve the raycasting algorithm. I am working on running on the GPU, and on using a „bounding volume hierarchy“ which groups walls in the same area into groups so not all have to be tested.