Mystic has 2 bugs:
The marine start wont weld shut all the way, making it possible to shoot through (exploit)
The C-Tunnel ladder cant be climbed up, its like a wall.
The vent leading to a hive goes vertical, it should probably be a ladder without the texture
Wanted to comment on these with what I think.
-Its not much of an exploit if the mapmaker didn't finish it completely. :p
-The ladder works sometimes, happens with the ladder in Aux Gen in ns_caged.
-The vent isn't made for marines, so there isn't much reason to have a ladder in it.
Now to add my two cents about it:
Its a good map, small enough to not get lost easily, nice vent system, and overall nice layout and texture style. My beef with this one, however, is that there are many small, cramped corridoors. Especially the corridors around Cargo Bay Hive, its nigh impossible to defend that area as an Onos with a buncha marines hopping up and down the platforms, dodging the gore, whilst the Onos gets trapped in the hall leading to the ladder in an attempt to escape.