A gory anime shooter, complete with Q/E leaning, alternative reloading mechanics, a variety of weapon types with secondary fire modes, kicks and slides, and a half-naked protagonist. There are some instances of bullet hell, but they're not overwhelming.
The game can played both slow and tactically and fast and furious - use corner leans and aim-down sights, or go sliding in, kick them into a wall and hip-fire a shotgun in their face.
Bullet impacts on enemies reward you with pained screams and gory explosions that leave behind parts of cute anime girls. The violence factor will be off-putting for many folks, so be warned.
There are a variety of enemies, but they tend to fall into what would be expected of a sci-fi shooter - assault rifle troops in heavy armor, bulky flame-throwing units, shotgunners wearing body armor, automated drones and turrets, mechs, tanks and VTOLs.
Your arsenal is fairly typical - pistol, assault rifle, shotgun, sniper rifle, SMG, rocket launcher / LAW, grenades, chaingun, an axe, satchel charges, an area artillery designator (ok, the last one isn't typical). However, all weapons have alternate fire modes that make them more interesting and allow adaptation to a situation - for example, the starting pistol can utilize rocket-propelled grenades, the assault rifle can also fire a continuous laser, and the shotguns can fire slugs / electric bolts / grenades.
The movement generally feels pretty good, though some of the platforming can be frustrating due to the game's awkward mantling - sometimes the protag grabs a ledge when you expect it, sometimes she doesn't.
There is some health / stamina / energy management - your hunger level determines your maximum health and stamina, but can be restored by eating food. Stamina can be utilized for sprinting, sliding, and kicking, as well as holding your breath for sniping and slowing down time (using Oxygen canisters).
Overall, a great, violently gory shooter.