Just fired up the game to check it out, and I installed it on my XP SP3 machine just because I play a lot of these kinds of games over there. And it worked! The game page said Windows 7 or above, but glad to know some things still work on XP.

At least, for now. Maybe I'll hit a stonewall later... but I can always install it on my Win10 pc if I need to. Nice game!