<there was a long post here about me being depressed, but screw it, gotta fight these demons alone>

I've tried to learn GLSL shaders and rendering pipeline for some time now, using only good 'ole C and X11. Some things are hard to wrap my mind around; memorizing stuff is another challenge. Demoscene is my main source of inspiration, but lately I thought maybe it can be somewhat fun to make a simple game using what I know. Danmaku shooter (shmup) is my main idea now, but maybe there is something else folks can suggest to me?