Green aliens ceiling walkers attacking the player
https://files.mastodon.social/media_attachments/files/111/335/736/616/348/439/original/fb2321f4474c8e78.png
In Extremis is an obscure 1993 FPS from France, developed by Blue Sphere (and not by Delphine as many reported). Along with stealing (they weren't licensed apparently) sounds from Alien, interestingly it featured automatic opening doors years before Quake did.
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