OK, so a while ago I had posted Compact Maps, a series of sets several maps each, fairly small in size. Well, I made a mistake back then, and what I thought was Compact Maps 1 by Josh Mills was actually Compact Maps 1 for the First Encounter, a separate entity. I'm here to correct this mistake today. Compact Maps 1 contains four (technically five, but one is a non-functional stub) maps, each of which is an early version of a later Castle Xeen level. To quote the readme, "Castle Burlock resembles floor 1-1 or Castle Xeen, What a Yough MAP! resembles floor 1-3, The Jails resembles floor 2-1, and Mission Whacko resembles floor 1-2.". Some of these floors aren't actually that compact, but elbow room is still scarce as you are assailed by absurd numbers of enemies. Sorry for the confusion and have fun.
Compacted vertebrae