Thanks!
Ctrl and space, usually used for crouch/jump in FPS, control vertical down/up thrusters. To rotate, you can use Q and E (often used for leaning in tactical FPS) or you can bind a key to enable mouse rolling (I use one of the thumb buttons on my mouse). Of course you can rebind these keys to whatever you want. When you enter gravity or attach yourself to a spider surface in zero g, your mech automatically orients itself.
It runs on Windows/Mac/Linux (Unity engine)