41 Games: Thomas Was Alone
The writing in this game does an excellent job elevating a simple set of shapes and platforming gimmicks to personalities and recasting their interplay as cooperation. If only more simple puzzle games took the time to do this; I'd enjoy them much more. It cheats of course--a narrator simply tells you what each shape is thinking, but it's a good cheat.
The puzzles are never too taxing, but the platforming controls can be a little slippy, with the game's physics sometimes seeming to override inputs, with fatal results. Fortunately, respawning is instant, levels are small, and checkpoints are generous.
I admire the turn the narrative takes in the last third; but unfortunately the new shapes never manage to make the same impression the first few do.