Mixing Ammos

Use the skills to attack (or being counter-attacked by) the enemies, and defeat the boss.
Control Ely, Astra, and Jennifer to hunt down their long-term frienemy - Exo, uncover the traitor - Dreyar, and defeat the ultimate Exo - red.

You are not going in grids, but moving freely. Walk, Run, or Sprint to any movable place and attack your enemies with Gun/Sword/Shield.
Gun/Sword/Shield skills are long/mid/short ranged, while Gun skill can break Sword skill, Sword skill can break Shield skill, and Shield skill can counter-attack Gun skill. Choose your next move wisely!