The void reclaimed your form.
Keyboard: hold Shift to boost. Mouse steering: hold left click to boost; hold right click to brake. Release right click to resume. The arena contains 18 free-for-all bots. White-ring spawn protection lasts 3 seconds and ends when firing or using Q. Menus and P pause everyone. Bots keep playing while you are dead. Press Q to activate your hull ability (hover over its HUD label for details). Press A to toggle autofire in mouse mode; F toggles it in either mode.
Select your ship before entering the arena.
Killstreaks: kills within 8 seconds form a chain. Back to Back: two unanswered eliminations of the same opponent. Dominating: three. Arena domination: 50 kills in one life, announced again at 60, 70 and onward. Achievements grant recognition, not combat bonuses.