The bugs I have found are all graphical.
And as for tips, you could make the battles easier by
1. Lowering the levels of the lizards
2. Decreasing the quantity of enemies in encounters
IMPORTANT TIP: Kindly place a reset button in the mirror puzzle room, and you can also change the ground texture. The current one looks untidy.
POINTERS: The scenario was done by a level 35 two-man party, Easy.
Good Luck on getting it finished. Best regards from me