This was the only IFComp 2018 game I had never finished. I finally finished it today. There was no walkthrough at the time of the comp, and the one in there now doesn't work for the last area.
But I finished it today, and that last area wasn't too bad!
The reason I had so much trouble is because Quest has synonym trouble, and the author didn't implement very many synonyms. Quest also has context-sensitive commands, which is great except when it makes commands seem wrong when you're just using them out of order. So for instance, "USE MATCH ON LUMP" gives an error unless you've done everything else completely right.
Other issues are unguessable puzzles, leaps of intuition, etc.
But the characters are fun, and it's all very imaginative. I remember Steph Cherrywell made the switch from Quest to Inform and ended up winning IFComp. I think almost all the issues here are with the Quest engine, and that the author has great ideas that may possibly be expressed in a different format.