Microvania is downloading...
We made Filament (https://itch.io/jam/gmtk-2019/rate/460871). You have one axis of control, forward/back along a curvy path, with random twitchy physics-y action. Probably too hard, and sort of random, since we just threw all sorts of different level ideas in there. But you can skip the ones you don't like.
Other fun things I've found so far:
The Last Dodo (https://itch.io/jam/gmtk-2019/rate/463019) is a one-button twin-stick shooter. Kind of frustrating but also hilarious.
Dungeon Solitaire (https://itch.io/jam/gmtk-2019/rate/462358) is a little roguelike where you fill in parts of the dungeon with cards drawn from a deck (you draw three cards, play one, and discard the other two to be used on the next level).
One Frisbee (https://itch.io/jam/gmtk-2019/rate/462216) is sort of FIFA with dogs and a frisbee and four single-player teams. Not quite my thing but pretty well done.