itch.io

Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.

Pretty sure everything is indie on itch.io but just in case you want something extra indie.

The internet

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

Games that can be played alone

Sprites are generally 2D images used in games to represent objects. They can be animated or static, and come in different styles like isometric or top-down.

Resources for building and relating to User Interfaces, how the user interacts with your program