Turnabout Intruders - masterful staircases, good flow, narrow ledges, satisfying gaps for viewing landscape texture around the perimeter of the map, interesting use of colours and textures and a sensible size for current multiplayer games style.
Inaugural Trams - masterfully crafted height map. Perfectly spaced towers in proportion to platform height. Dull grey dystopian feel with odd bits of snow (or ash?) looks cool.
Channel Z - a rather attractive compulsory sewer level.
The Tremelo Call - You know this map has some promise but doesnt seem finished. Good 5D staircase to build around. Something fishy about basalt columns, not your best work here, consider how they are generally in a field of similar size columns and the height can vary widely the base shape spacing not so much. Something to think about.