Swanncraft
This is a campaign-story style tower defense map. You play as Chief Engineer Swann as he helps defend a Mar Sara outpost from incoming waves of Zerg.
This started as a project to learn the SC2 editor but ballooned into a full scale map with multiple upgrades, an inventory system and audio dialogs.
This map is a tower defense but you can't move the camera around (well you can but it just snaps back to your worker). You can't see how your towers are doing unless you build them all in one place and park your worker there (which you don't want to do, map encourages going around to collect minerals). It's extremely maddening and makes this map completely unplayable.
Also, found it very easy but to be fair I quit after like 10 rounds because I couldn't stand the controls.