Curtain is a short, powerful game by Llaura Dreamfeel, available on their itch.io page.
I won't say too much about it, other than I played it about a year ago (after Danielle Riendeau recommended it on an episode of Idle Thumbs), and it's stayed with me for a long time since then. I really recommend it, though take note of content warnings on the website.
Sacramento is a lovely little game by Dziff, available on their itch.io page.
It's a little quiet, dreamy watercolour space of sun, wind and wildlife to explore, with accompaniment by Glass Body.
It's more than worth a dollar and 10 minutes of your time.
(via a Hannah Nicklin tweet)
I watched this interesting talk on game design by Jonathan "Braid" Blow and Marc "Miegakure" ten Bosch. They espouse and explore a particular design aesthetic where the designer essentially plays the role of a mathematician. "Good design" then becomes a selection of orthogonal mechanisms (axioms), and an exhaustive-yet-minimal mapping-out of what's derivable (theorems), and then demarcation of the boundary. Since it needs to be fun, the real art has to come from crafting surprise and tweaking axioms to capture exactly what you want. They both make some very interesting points, and I thought this comparison with mathematics was a particularly cool and apt way to frame the ideas.
This aesthetic is particularly apparent in the examples they use in the talk, including Braid, VVVVVV, Ikaruga and the as-yet-unreleased Miegakure.
Watch it here: