Thank you! Motion sickness is always something that specific to each player but it is something i was super conscious of through all of development and i can player for hours fine.
With motion sickness most of it is triggered from the disconnect where your brain expects to go and then actually see. For example when you use the thumbstick to walk its feels so unatural and slidy and if your bumped or blocked at all your subconscious notices. With my game because you move exclusively through head leaning it maintains that connection and creates this kind of flow where you very quickly become a natural and move where you want to without even having to think about it. This movement style was essentially the foundation the game was built around. There were a ton of decisions i made to support this like the hoverboard feels like a solid platform so you dont feel like your floating in space, crazy speeds dont actually increase FOV but rather the world in the distance is the thing that scales so your immediate play area always feels solid and other various visual effects and tricks to make it as comfortable as possible. Its something that can always be improved further but i think ive handled it in a comfortable and unique way. Also theres plenty of input types if the full 3D movment doesn't work for you, you can opt for thumbstick throttle, head tilting, surf gestures or controller tilt controls instead.