JavaScript is the one I've been familiar with since 1996, basically as long as it's existed, and when I first created this engine back in 2000, it was the natural choice, both due to the familiarity and the fact that the SpiderMonkey JavaScript engine as used in the Mozilla browser (which later begot Firefox) was open source and freely available. I've since replaced SpiderMonkey with Duktape, as the former became too heavy for my purposes and no longer wanted to play nice with my compiler suite either.
A Royal Midnight Snack uses the same engine. All my games on here do. Heck, you can just put any of the game's executables in the folders for any of the other ones - only the file name and the icon differs - and they should run just fine. But Royal Midnight Snack does not have any screen scrolling (which seems to be the issue here). If you try Jeffrey Jetsam, you might end up having the same issue, as it also has a wide scrolling background.
