Mostly closed license: "You may not use, alter or redistribute this Software for commercial purposes or in any manner that isn't for personal or hobby reasons. This includes, but is not limited to, selling altered or unaltered versions of this Software, or including advertisements of any kind in altered or unaltered versions of this source."<p>Also: "This repository does not include the source code for the engine, it is just the source for the game Delores." The engine is offered as a Win10 and macOS binary only.<p>Also: "Delores is coded in a custom language called Dinky that is based on and inspired by Squirrel."<p>Also: it requires the use of FMOD, a proprietary audio system.<p>These aren't knocks, just things worth being aware of before getting too excited at the headline.