I've played a lot of Garry Francis's games and enjoyed them. They always seem to have a general crowd appeal to them, relying more on the interesting puzzles than the characters. For instance, Kenny Koala is a fun game worth checking out if you haven't, and all the animals you talk with are fun and add to the environment, but you don't do much with them besides give them items to make them happy. MoWH seems to pay a lot more attention to the characters. They go places or restrict you. Maybe he's done this and I forgot, because he's written a lot. But I think the whole conceit of MoWH is very appealing: you are Ian McKenzie, and you get kicked out of class, as 13-year-old boys do, and lo and behold! You have the school to yourself. A perfect time to find missing treasure that will make it financially stable. Especially since this time, your stunt might get you expelled, unless you have evidence of good behavior elsewhere.
I was a bit worried when I read MoWH's summary, because if there is a lot of treasure, then perhaps the school is necessarily very, very big. Which means the game might be exhausting. Maybe you are worried, too. But thankfully, in the spirit of TALP, it's under control. I lost track between 15 and 20 rooms, because I was able to hold it in my head, and it was pretty clear some rooms weren't useful. (That, and I checked with HINT, which is handy for making sure you're done somewhere. Perhaps for future authors, another command that tells only if you're done here would be even nicer. Cragne Manor had its coffee cup. But for a z5 game, this is great.) It still feels big enough to be a school, though. Just stuff like having one hundred lockers in a locker room and needing to find the right one (twice) and some general hallways and a service elevator makes enough to hack through for a satisfying adventure, but you're not going to get stuck anywhere.
And I really like that you spend more time with an NPC than usual in one of Garry's games–here a janitor moves around impressively for a PunyInform-sized game and gets a lot of attention without seeming too wise-old-father-figure. There's a small part where you have to go back to ask him for more help, and he gives it, and it was surprisingly hard for me, not because one shouldn't repeat things in adventure games or be expected to, but because Ian generally has caused trouble and doesn't need to bug the janitor, and there's another adult besides his teacher who impedes you slightly. The 13-year-old awkwardness comes through!
The puzzles? Well, they seem more straightforward than usual in Garry's games, and that's appropriate given this is a TALP entry. There are a lot of tropes. There are locked doors and drawers and an apparent dead end in a basement, with a secret passage behind a secret passage. In a way, it's been done. There's a safe, too, and finding the combination is strongly hinted. Amusingly, it's one piece of information you do remember from class, so it all makes sense. You won't have to break your brain.
I think MoWH did a good job of establishing tension despite a generous helping of tutorials and hints if you want them. And one thing it reminds me of, too: a lot of Garry's games rely on puzzles that experienced adventures may be acquainted with, and yet at the same time I haven't noticed a lot of repetition or overlap between games, which is impressive in a general sense.