This is a VGA DOS game I wrote in 1996. (original page.) It is mostly C++ (Borland C++ 3.1) with some 386 optimization and hardware specific routines in TASM assembler. source code
You can run spaced.exe in a browser window! It's incredible that this works, many thanks to em-dosbox! I've tested it in Chrome on Ubuntu, ymmv.
To play, you need to allow it to "disable your mouse cursor" and then click a second time to start the game.Type Esc to get the mouse back once it is "captured" by the game and again to pause the game.
If you hit Esc and end up at a DOS C:\ prompt, type spaced.exe to restart.
This is a tiny bit harder to setup, but dosbox runs on any OS and will emulate spaced.exe as fast as possible (without me rebuilding it for modern operating systems and processors.)
It might take a little while to start, and if it doesn't do anything, try hitting Esc and running it again.