A complex series of wall jumps can be used to access Space Jump through a secret item tunnel, bypassing the Storm Gate.
If Cross Bombs are obtained first, the player can instead store a spark, break the blocks with a Cross Bomb, then simply spark up the tunnel.
A Melee Morph Pseudo can be used to backdoor Space Jump, hitting the blob that's normally used to exit. This requires very good shot timing so that the Diffusion Beam triggers from the highest point of the enemy. The timing isn't frame perfect, but if you don't shoot on the correct frame, it can fail unless RNG gives a good Diffusion pattern.