Posting this again, although I'm now seriously starting to think it's not even real... I've even tried locating the soundtrack that I remember so well, but with no luck.
Ok, here's one I've been trying to track down for years, but had no luck whatsoever. Even my brother whose machine I would play it on has no idea what I'm talking about when I ask him.. But I can even remember the soundtrack, loud and clear.
The game's a 2d arcade-y game in which you're a robot at the bottom of the screen, catching gems (and avoiding the grey ones) that start raining down. The longer you last, the more gems start raining down, until it's a constant flow. The game ends if you catch too many grey gems.
It was sometime in mid-90s that I played it on my brother's PC.