[Aperson4321]

"There is no real solution to the movement problem though"

There is no absolute need to let the player experience real acceleration in unrealistic games, you can't differentiate between being at constant motion and being stationary. What I am getting to is that in unrealistic games you can make things move only at 5km/h or not at all, sure not realistic but possibly ok enough for less players to get motion sick, sure not a perfect solution but game developers have done amazing things with the limitations of 2d screens, and some people still get motion sick from shooters played on 2d screens. Not polished enough for real mainstream use but still polished enough for a very big market.

Alternatively you could make the player accelerate at steps of 5km/h:

while(Speed > 10){ Speed = (Speed modulo 10); inGameSpeed = (inGameSpeed + 5); } actualPlayerSpeed = inGameSpeed;