https://store.steampowered.com/app/1091590/Cathedral_3D/
Cathedral 3-D is a fast-paced, arcade, single-player, endless arena inspired by the early 3-D shooters of the 90s.
Become a terrifying Monster and protect your lair from endless waves of human enemies.
Survive as long as you can by using your fiery breath and incredible agility.
Activating the steam key
1) You must download and install Steam
http://steampowered.com/download/SteamInstall.msi (if not already installed).
2) Create a new account on Steam or go to an existing one.
3) Select "Activate via Steam ..." in the "My Games" section, and enter the key received after payment.
4) After activation, the game will appear in your list of games and you can install it.
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