Ghost gallery is an escape-room game (narratives in Chinese) I wrote in a week in June 2014. It is purely implemented in low-level OpenGL and runs on Windows (Ghost Gallery.exe file included).
You have to escape the gallery by solving several puzzles within time limit. For example:
BGM: from video game To the Moon
Pictures: my friend DQ
Texture: free online, very low quality - -
No more spoilers! Try it out yourself!
PS: the control is a bit hard by mouse and I would suggest using keyboard mainly.
PPS: the code and directory structure are quite messy and I don't recommend reading...