Cyrax
You have part of the problem. I have changed the script to allow for there being no walls in a level ( causes the boxes problem on levels 14 and 18 ) but the bigger problem is that these Teeter levels where designed for an 800 pixel wide screen. I will attach a new version of the script tomorrow ( it now creates main.levelpack.json from a folder of txt files ) but all the posted levels have a parameter greater than 640.

Edit : Its mostly the boxes problem that stops thing working but the levels are mostly impossible because something is off the screen = you cant even do level 1.