My friend and I have been using this Pandemic period to play the Enchanter trilogy over Discord. We just finished Sorcerer and we have previously finished Planetfall/Stationfall.
This game was one of our favorites Infocom games we've played. It has a definite story arc, from the tense intro to the final "chapter". Because there were so many red herrings (puzzles that don't need to be solved and items that are never needed) we didn't even know we were in the endgame until we looked at our score and realized we were close.
There were several unique puzzles we hadn't seen before (both areas which had maze-like mechanics). Unlike in Enchanter, we never had to look at any Invisiclue hints to solve them. The setting succeeded in giving us the feeling of constant danger, particularly when we ended up in the super creepy Chamber of Living Death.
A quibble we had were some areas that felt like randomized deaths that were more annoying than fun. (I was ready to give up on getting anything useful from (Spoiler - click to show)the slot machine when we kept getting killed over and over randomly before my partner's perseverance finally paid off.) Otherwise this is a classic worth playing.