It is tricky but possible to cross the room without any damage by rolling through the room. The enemies can be killed with extra Power Bombs, but without them, it's arguably easier to roll through the room without the use a Spring Ball or Bombs. After crossing the room, use a Power Bomb then quickly exit G-Mode before it explodes in order to break the bomb and Power Bomb blocks above. Without Spring Ball, it is still possible to place the Power Bomb high enough to break all the blocks above from an IBJ and still exit G-Mode before it explodes.

Entrance condition:

{
  "comeInWithGMode": {
    "mode": "indirect",
    "morphed": true
  }
}

Requires:

"h_canArtificialMorphMovement"
{
  "or": [
    "canTrickyJump",
    {
      "and": [
        "h_canArtificialMorphPowerBomb",
        "h_canArtificialMorphPowerBomb"
      ]
    },
    {
      "enemyDamage": {
        "enemy": "Sm. Dessgeega",
        "type": "contact",
        "hits": 2
      }
    }
  ]
}
"h_canArtificialMorphPowerBomb"

Clears obstacles: A, B, C