Biggest heart break of the competition award has to go to Tesa and Michi's Archaist. This game was rushed into completion after many barriers, just to fall at the final hurdle. A small single bug rendered the game unplayable on many PCs.
The game has been fixed now, and is a superb example of a highly accessible game. Play using a single switch, keyboard, joystick, mouse or head-tracker.
Tesa and Michi also wrote one of my personal favourite one-switch games, Alice Amazed.