This is a great idea. Official support can really reward many player's work and promote their creations, that would otherwise recieve little to no attention. There're so many good SnapMaps that I've played that I can't really choose my favourite. There's some awesome stuff from Riomaki and elfinko, great custom-geo levels from Sorrowangie... So I will just nominate my own map, that a few people greatly enjoyed.
Name: Haunebu Map creator's name/Snapmap name: Janush Map name: Teleportation Research Map ID: JBKKLRZB Map descritpion: Tried to make it close to the campaign style beloved by fans. Packed with action mixed with atmospheric moments. This map shouldn't bore you at any point.
I also recommend a prequel to this, Phobos Labs [5ZZXBJ8T].
Also, we are starving for another SnapMap update. Hope it will drop soon.
Wow, thanks for the mention =D