Upside Down (itch) (jiaying330)

* Based on https://github.com/abagames/crisp-game-lib * Minimal JavaScript library for creating classic arcade-like mini-games running in the browser * GitHub pages: https://github.com/Jiaying330/Upside_Down Play the game via GitHub: https://jiaying330.github.io/Upside_Down/index.html?upside_down/