14 Levels, 9 unlockable weapons
and lots of enemies and boss fights.
It’s the first (and only) "
玩法：
Use the mouse for the menus, and the keyboard in-game.
Move: Arrows / WASD
Shoot: Space / Ctrl
Pause: Q / Esc / Enter (opens the pause menu, where you can continue, retry or quit the current level)
Mute: M
Overlay on/off: O (scanline effect)"
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