The listing, Power-Up [STEAM KEY] has ended.
http://store.steampowered.com/app/312640/
POWER-UP is the modern-retro styled Shoot-Em-Up from one-man game studio, Psychotic Psoftware.
Spanning vibrant locations to a monster soundtrack, Power-Up thrusts you into battle with a diverse range of fighters, freighters and titanic level guardians. If you loved retro SHMUP classics like R-Type, Hellfire or Project-X, you'll get a kick out of Power-Up's slick, detailed visuals, challenging gameplay and impressive arsenal of weapons.
SYNOPSIS: The Earth is doomed! As you pilot the prototype fighter, Weapon-F through the debris of your vanquished escape shuttle you come to realise that you are the last human alive. You alone must take on the army of reptilian monsters responsible for the destruction of humankind. You alone must carry out your final mission... Revenge!