Space Marines do serious damage “up close and personal”. Deal massive melee damage with your Chainsword, Power Sword, Power Maul, Combat Knife, Power First, or Lightning Claw. Tap three times for a combo move or press and hold for a charged attack, of which each weapon-type has a unique one.
The trusty Plasma Pistols, Bolters, Storm Bolters, etc. - sometimes one of these is just what you need to get out of a tight situation. Keep an eye on each weapon’s stats and modifiers, they vary quite considerably in power, effect and cooldown.
Some floors can be broken using an Aerial Strike (Jump Pack jump + Melee strike) and some barriers can only be broken with "Power" weapons. Explore to find new paths through levels.