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Your wet erase mat. Online.
Tableplop is an easy to learn, fun to use virtual tabletop for role playing games. It includes everything you need to play TTRPGs remote apart from audio chat and works great on mobiles and computers.
Could try tableplop, I think it might be heavier than owlbear, but might hit your sweet spot. Haven't really tested myself, just know it's a relativity light vtt.