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Crystal Caves! I've been trying to remember the name of that game for ages! I never bought the full version but played the shareware endlessly...

There's a (presumably) excellent modern port of it a available on Steam: https://store.steampowered.com/app/1330890/Crystal_Caves_HD/

I say presumably because I played their excellent Secret Agent HD port but haven't played Crystal Caves yet.

There are also infinite clones of it. But I'm not aware of any open source one yet