This is a really cool game concept. It's DRM free, open source, works on Windows, Mac, & Linux ($20).
@starbreaker Maybe? Looks promising, though... he says: "The only required library is OpenGL, which ships standard on MacOS and Windows and is readily available on GNU/Linux as well. On GNU/Linux, you will also need to install SDL 1.2 and xclip for copy/paste support."
@kevinja I wonder if this will compile on OpenBSD...