I like Touhou very much, so I am working on a Touhou-ish danmaku (bullet hell) game. It is still in early development, though.
Here's the today's screenshot: (https://imgur.com/a/9Th50Zw)
It uses pixel graphics, the CPU draws on a pixel canvas, which is eventually rendered onto a framebuffer. I chose this rather childish approach in order to prototype first, and accelerate later.
The main difference from Touhou Project or its spinoffs will be that the stage will actually be scrollable with 'nests' that spawn enemies shooting at you.
The game is written in Rust, uses Vulkan to display the canvas, and licensed under GPL-3.0-or-later license so that it will always be a share-alike project.