Some odd news to go along with your games: Recently the American Heart Association announced that the Bee Gees song "Stayin' Alive" provides the perfect beat to follow while performing chest compressions as part of CPR on a heart attack victim. While this will certainly help save a number of lives, I really don't want to see disco (or qiana shirts) make a comeback.
Garden of Coloured Lights (Mac/Windows/Linux, ~3MB, free) - A vertical shooter with some music game elements (similar to Rez, but 2D). Choose your three weapons from a grid at the beginning of the game, then head out into the field and upgrade them as you go along. Four stages, a sharply increasing difficulty level, and plenty of replay value thanks to the tri-weapon setup.
Treasure Hunter Man (Windows, 1.5MB, free) - Your typical platformer game from the creator of A Game with a Kitty. Explore the island, gather tons of treasure, and learn new abilities along the way. The game is technically unfinished, though it's perfectly playable and coherent from beginning to end and there shouldn't be any game-crashing bugs.
Timerocketxby (Windows, 1.3MB, free) - Another superb (but short) release from Hempuli, creator of Once in Space and Floating Islands Game. Pausing and rewinding time is all the rage in games nowadays, but Tomerocketxby takes that to a new level by freezing the game and turning almost every object into a platform. Stand on spikes, bits of enemy floating around, even raindrops to find your way through the stage. The download link is at the bottom of the linked page.
Skullpogo (Windows, 1.5MB, free) - An arcade game focused around one simple gameplay element: building combos by jumping on pigs and bats with a pogo stick. Yep, it's true. Power-ups appear from time to time to make things a little crazier, but otherwise it's straight-up hopping.