Hello there, Arale!
The essential controls for this game are quite simple:
Basic movement: WASD for movement; Shift for running; CTRL for crouching/sneaking.
Interaction: E / LMB to interact with the game world.
Dialogue: LMB, Z, E, SPACE to continue dialogue; hold CTRL to accelerate text; X or RMB to try and cancel the dialogue.
Mechanic: F7 to load a slot; ESC to pause.
Those are the most important controls really! I hope this was useful for you :D