1) Why you make main wing rotate instead of tail wing?
2) It has no limit on rotation
3) thrust not enough
4) you can tweak k-wing - calculate and add initial speed to spawned circles for leak prevention
Many things in that scenery looks very familiar to me
Do you want to give a credits in scene description to someone?
Moving ground effect too fast for that scale - you better slow it down.
And bike needs more power! 8/10