Commands

Arrows or W A S D: move your mech (up is north on the screen). Your mech turns its torso to the marked target by itself. In menus, move the highlight.
J or 1: fire the left arm. K or 2: fire the right arm. Enter / Space (OK): fire both arms. Hold to keep firing.
L or 3: fire the shoulder weapon (missiles or mortar). Shift or 4: boost (a quick dash that adds heat). T, F or 5: change target.
Backspace / Esc / P / B: Back, or pause a fight (Resume, Retreat). OK skips a champion intro.
+ / - or the mouse wheel: zoom the arena camera.
Touch: drag on the left half of the picture to move. Hold the weapon, Boost and Target buttons on the picture to fire, or use the pad. Tap a menu row twice to choose it; tap a card to close it.
In the league: left / right changes league; up / down picks a bout. In the market: left / right changes the part category.
Choices menu: pause, how to play, new game, sound, difficulty (Rookie, Veteran, Ace), save slot, graphics quality (Low, Medium, High), theme.