It's simple:
4 menu items:
center - game
bottom (door) - exit
left (window) - icon/fullscreen mode
right ("I") - information
Controls (specified in the information section):
"W", "A", "S", "D" - move
"Q", "E" - rotate
"left mouse button" - attack
"Esc" - menu
"R" - restart level
"F5" - restart game
The goal of the game is to destroy the light source by throwing stones without hitting the light itself.
At the beginning of the game (first screenshot) the character is in a narrow corridor, the only exit from which is behind the stones and the light source, which seems to hint...
Oh, and I tried so hard to make everything intuitive...
It didn't work. I'll try it at the next jam)