RetroBlit is a simple to use game framework implemented as a Unity Asset. It aims to create an ideal, low friction environment for making pixel-perfect retro games from the early 90s era. RetroBlit takes advantage of the portability, and the ease of deployment that Unity provides, but does away with the Unity Editor interface in favour of a traditional game loop, and code-only development. There are no scene graphs, no GameObjects, no MonoBehaviour, there is only a simple low level API for rendering sprites, fonts, primitives, and tilemaps. RetroBlit also provides a simple API for handling input and playing sound and music.