This is a simulation, so there are not many controls. - Click the green flag again to use different waves - Change speed to change the speed of the boat. And because of physics, it can also go backwards - Change the 'res' slider to change the resolution of the pen.
Use Turbo mode or Turbowarp!! - Please comment for any bugs or glitches - Most of the answers to your questions are: math, physics, and use Turbowarp here https://turbowarp.org/611956125