With so many ICS maps in the game now, they're starting to get hard to tell apart, especially because they essentially have two identities (ex. pl_millstone_event for Hellstone). Terror skips this identity crisis being created only as a Halloween map, yet still keeps the same compact size of other ICS maps. I believe on the 3rd point, BLU spawn is literally around a corner to the objective, and I feel like these strange design choices are waved off because it's an event map.
And maybe there's merit to that, because those same design choices made some fun stand off moments as a team holding the frontline back. But I am sensing fatigue in the theme where Terror looks the same as Gravestone (Rumble event). And comparing this to other accepted Halloween maps, I don't leave a session of Terror remembering much because there weren't any memorable landmarks, or I didn't engage with them.
This was less apparent when Hellstone was new, but even the last point on this map is another giant pit. I also found an exploit to avoid some conditions of map spells, notably melee only by returning to spawn and changing loadouts to get your weapons back.
I enjoyed playing this though, I just don't have as strong feelings to remember this map by compared to say Megalo (ghost train with the turntable), Cursed Cove (ghost pirate port), or Cauldron (cauldron spells). Terror? Maybe the pit, which has already been done by other maps, and generously the map spells which aren't unique to the map itself. Even the name alone doesn't evoke anything special for me either to recognize this map by.