https://davevsziggy.itch.io/dave-vs-ziggy
"Dave vs Ziggy"
This is experimental work - the first fully playable first-person shooter with true 3D, written in an Excel workbook. You can go through the large levels of the secret base captured by aliens, found useful items, kill various types of zombies / creatures, and encounter various features. Sometimes you need to use your logic to move on. The real story will be collected from random messages during the game. You can save your progress at any time (3 slots are available) and restart it later. The game features absolutely authentic codes, levels, art, models, sounds and music, distinctive "retro-pixel" appearance and feeling.
In short, the story tells us about an accident at a secret research facility called Project 7, where an experiment with the body of an ancient alien from Antarctica failed, and the entire space of the base was filled with transformed zombies and alien monsters. Our main character - Dave - is just a low-level worker from the external level of the base, who remained alive by a lucky chance. He is not a hero, like a Doom guy, all he wants to do is just run away from here, but he needs to go through the entire base to remotely open the external gate. During the game, he will survive despair and become a strong fighter against evil.