Comment by kylewlacy

Was it Ichor[1][2]? A bit later than the "early Windows" days I think (I remember hearing about it around 2007), but it also matches your description and it was the first thing I thought of after playing the game in the post

[1] https://www.youtube.com/watch?v=9MGoyAiPQog

[2] https://www.fun-motion.com/physics-games/ichor/