Browser game
Hellmouth
A monster hunter in a long coat, two stages of things that answer to different weapons, and a Hellmouth at the end of it. Every weapon carries a damage type and every monster declares what that type does to it: fire ends the shambling dead, only silver kills a werewolf, and a vampire has to be broken open before it can be finished.
Two stages, two bosses, an open-world mode with six regions and six keys, original AI-generated art, and audio synthesised at runtime. Nothing to install: it runs in the browser as a single file.