The start paddle is on red to emphasize that it doesn’t matter. You can mirror the green ramps and start color for the same result.
https://www.lodev.org/jstumble/?board=rlerlf0ferrfe1rfrlrf1eleerllfilfeleel_8_8
For reference the official solution:
https://www.lodev.org/jstumble/?board=rlerrf0lflrfr1lflrfr1lfllfriferfr_8_8
Press blue to start