The good: *Short and fairly straightforward, so there is little chance of getting lost. There’s no terminal but there doesn’t really need to be one (until the end).

*The secrets are numbered and labelled. This is a great idea and I wish more maps did this.

*Combat was decent enough, with no unfairness. There are pattern buffers and shield rechargers available.

The bad: *Lots of enemies have trouble triggering. I think they are set to “Deaf?” Use zones for monster triggers instead. The fight by the x1 shield recharger can be trivial or difficult depending on how many monsters actually end up triggering.

*Ceiling lights are in the floor.

*A pervasive lack of ammo. I had to fall back to my fists at one point.

*The stupid canisters everywhere can block the player’s movement, which is especially annoying if you happen to be in combat.

*An abrupt ending that yanked me out of the level before I had a chance to fully explore it. I find some assault rifle ammo that I can't use, I think the nearby closet might have an assault rifle teleport in (because that would make sense), but nope! It's the level end! I don't even get to use the ammo I just found.

This is why terminals giving the player the option to “ESC to abort” a teleport are great for level transitions. This part may have been true to the original Heretic level, but it did not translate well into Marathon.

*Lighting could use some work, but the actual architecture is OK.