I, also, found that DOSBox wasn't able to run the .exe file.

Have you considered just making the game directly playable online? Sure, this eliminates the "potentially pay me some money" funnel associated with the download link, but it would be a lot more friendly to casual onlookers such as Hacker News.

To make that happen, you'd embed DOSBox on the page itself, with a preloaded disk image containing the .exe (and/or the .bas source plus an interpreter). I have a tutorial/example here, which (six years later) still seems to run fine: https://quuxplusone.github.io/blog/2019/08/11/dragonflight/