This brings up a WARNING that OpenGL rendering isn't finished. There is an option in the settings where you can switch from software rendering to OpenGL rendering.
The actual graphics rendering is done in software on the CPU, OpenGL is currently not supported. That's not all that strange, the game is based on a Doom game engine. It is kind of like the graphics the original Doom game had when it was released in the early 1990s.
The tutorial does what it is supposed to do, it teaches you how to play the game.
Moving the mouse changes the 'camera' (your point of view). The keys are W A S D to move around, space to jump, space again while you are mid-air to charge forward and ⇧ Shift to spin like crazy so you can charge forward. The game starts with a built-in tutorial where you learn how to play.
