The original "Spacewar!" running on a virtual DEC PDP-1
masswerk.at
masswerk.at
https://www.masswerk.at/spacewar/inside
This was one of the links in the text you see if you scroll down the page instead of starting the game. Lots of other interesting information there too.
I've never played the original game on the PDP-1, but in the late 1970s I played a clone of it that ran on an 8080 system[1] hooked up to a Tektronix 4010[2] storage-tube terminal.
Stephen Russell was talking to the participants and Peter Samson was actually operating the PDP-1... my guess is this was a regular thing for them.
An interesting note... not only was Stephen Russell a creator of effectively the first computer video game... he wrote the first Lisp interpreter based on John McCarthy's paper.
John McCarthy, in an interview quoted in http://www.paulgraham.com/icad.html . Anyone lucky enough to meet Russell at CHM should ask politely for a photograph with him.
(1) https://archive.org/stream/byte-magazine-1977-10/1977_10_BYT...
Finally, of course I’d be happy to pay for a DigitalOcean or Hetzner shared host (contact info in profile).
The original version works with touch, as well. (The same controls are used by the printed version, including the visual assets.) If you don't get the touch controllers automatically, have a look at the option menu (the stylized gear icon at the top of the screen).
Moreover, any game controllers should be supported (matching the usage scheme from the 1981 anniversary reunion at the Boston Computer Museum using Atari joysticks.)