Hi. I am really struggling with the current wall mapping method. Bugs aside, the concept is fundamentally flawed as setting a corner blind offers no visual clues as to where the starting point is in 3d space (the old "small or far away?" problem.)
It would be much easier if you could move a wall once drawn as you'd then have better visual clues.
Another suggestion would be a workflow such as:
1. Click on the wall in two places to define a plane
2. Adjust the left and right extents with the controller
Step 2 could even be done automatically to some extent (just find the 2D point of intersection with the previous wall)
Have you considered open sourcing the code and keeping the minigames as your special sauce? I'm sure other people would love to help with the core UI.