Since Nova Drift will remain a single-player game, why not mess with the time flow? I also think that a new challenge mode regarding game speed could be added to the game too.
Tier 1: Adrenaline
> +15% game speed.
> +5% experience(+score) earned from orbs.
> +10% global damage.
Tier 2: Drift
> +15% global damage
> -30% friction
> Your damage has a small chance to stop (or slow down) the enemy.
> +35% game speed.
> +10% experience(+score) earned from orbs.
> Game speed decreases for a short time when you take heavy damage.