id create an open world space opera RPG. i wouldnt have the entire planets of each world be explorable. but a segment of them a map like the size of novigrade and velen on each planet. and when you fly off the planet and want to land on another, there is an "autopilot" part where it takes you to that small (relatively) segment of the world and you can land where you want within it. there would be at least 3-4 planets, and space stations that within space between planets where you can land and explore. all seamless.
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