Cute game and concept but I am very prone to motion sickness and spinning the room triggers it pretty bad. I'm not really sure how you'd counter this but I figured I'd mention it so you are aware.
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Those seem like good ideas! I was actually thinking about this at work yesterday lol. I think maybe if you create a circle of darkness around the edges of the screen while it's spinning it might help. A lot of motion sickness things in VR do something similar when you are walking and I think shrinking/de-emphasizing the amount of spinning content would help a ton.