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.

Contains (or is themed around interacting with) a musical score, soundtrack, or backing track(s).

For that old school look and feel.

A game engine and development environment for creating 2D games https://www.stencyl.com/