I passed all the levels with my son, there are only two problems:
1. Unable to start level 8.
2. It is impossible to finish level 10-room # 8. The guard always kills you.
And so the MOD-241 is quite well made.
If the author of the mod reads this forum, let him comment on these 2 problems.
In both cases, you need to move the guard 1 tile back-and everything will be fine!?