Shinespark to the first ledge. To use a flash suit in deep sand: vertically - quickly roll the directional inputs from forward to up and jump. diagonally, with minimal horizontal speed - while holding angle, quickly tap forward then press and hold jump.

Requires:

"Morph",
"canPlayInSand",
{"useFlashSuit": {}},
{"shinespark": {"frames": 17, "excessFrames": 4}},
{"or": [
  "HiJump",
  "canSpringBallJumpMidAir",
  "canSunkenTileWideWallClimb"
]}