Remix: TGISSTOGWLT (This Game Is Somewhat Similar To Other Games With Long Titles)

Build a small, playable browser game inspired by "TGISSTOGWLT (This Game Is Somewhat Similar To Other Games With Long Titles)" (Simulation, bullet-heaven, Retro).
Concept: You're the night operator of a buried 1983 fire-control bunker. Something is crawling in from the tundra. You can't see it. You get a radar that shows where things were about three seconds ago, and a lot of buttons. Every control on the console has its own key. No mouse, no….
Tech: use plain HTML, CSS and JavaScript (or a lightweight engine you know); keep it to a single page that loads instantly with no login or install.
Controls: keyboard and mouse on desktop, shown on a short how-to-play screen.
Players: start single-player (the original's player count is not stated in its listing).
Core loop: include a timer or round clock, levels, stages or waves that ramp up.
Steps: 1) get the core mechanic playable with placeholder shapes, 2) add win/lose conditions and restart, 3) polish feel, visuals and sound, 4) add your own twist (setting, character or one new rule).
Make it your own: don't copy the original's name, art, text or code.