Report any bugs here. I'll also respond to any bug reports posted in the comments so far since you can't reply to comments on steam workshop for some reason:

Checkpoint Guard mentioned a bug regarding the Spectres not following you past the first area in Quarantine Zone. They will usually follow you into the main battle area, but they won't progress beyond that. As far as I'm aware, this bug is due to the fact that I replaced the Ghosts with Spectres, I need to check the vanilla level to see if the Ghosts follow the player past that point, if so then maybe there's an issue with the Spectre's pathfinding but I'm not sure if I'll be able to fix that. In all my playtests the other Spectres were destroyed in the warzone area

And WW3 Artist mentioned that the final Pelican on Delta Halo doesn't drop off any troops. Were any of your initial allies still alive? As I understand it, the Pelican will only drop off new troops if all your initial reinforcements are killed, up to a maximum of four. So if only two initial allies survive, it should drop off two more. I'll have to do another playtest and kill all the ODSTs at the start of the mission to see if it works