I ran this one yesterday in low tier with four level 1 to level 2 PCs.
I went great. I made a warning previous of the session : it was a combat scenario with little to no investigation or diplomatic challenge.
The first combat was the hardest : those creatures strike way harder than their level may suggest. One of the characters would have died before even acting due to 2 crit back to back, if I didn't rule that the enemy canceled the second one when the first blow made the target unconscious and dying 2.
The second one is the most uninteresting, and I whish it would have been the optional one. Those creatures have very little options outside of spamming 3 ranged attacks per turn for very low damages and so less health that they vaporize when hit.
The arrival to the top was extremely early and the only diplomatic part went great. The last fight was not very threatening but cool, as the enemies have some pretty nasty spells.
The early cinematic event is obviously the main reason to ever ran this scenario, and I liked to roleplay it even if it's hard for a GM to report on such a cataclysmic event.
I proposed this scenario twice, once in the lower tier on Foundry, and again in the upper tier on PbD. The first session went very well, with a great 'Indiana Jones' atmosphere, a good puzzle and an interesting battle (against the mummies)...
For the game in the upper tier, I chose to play the animated statue instead of the mummy, because of the mummy's curse (who thought it was a good idea to put this curse on a scenario that doesn't specify how many days it takes the PJs to get to their destination and back? Guys, you can't be serious...)
The statue literally annihilated the PJs. With a list of (divine) spells ill-suited to dealing with a mindless enemy with very low reflexes, their options were quickly reduced to "try to survive and do a 20 nat to blow up his hardness". In the end, out of 4 PJs (two level 4s, one level 2 and one level 1 with double mentor boon + level bump), I knocked two of them out in 4 turns even though they had only inflicted 7hp on the statue.
They wanted to leave it at that, the guards intervened, the scenario failed: I'm giving back a chronicle with no bonuses to PJs who've been roleplaying for 2 weeks.
The first part deserved 4 stars, the second barely two: so I'm giving it 3, the average.