itch.io

Simple, fast-paced games with colorful graphics and catchy audio, that require few or no explanations, can be played in short bursts, and usually require a lot of skill. Similar in style and spirit with the arcade game cabinets of the 80s and 90s.

The 48 and 72 hour game jam: http://ludumdare.com/compo/. Theme: Shapeshift

Games which have short playtimes and can usually be completed in one sitting.