i really found the mechanic interesting tbh.
Though I do have 2 nitpicks , one, you can't know whether shifting will teleport you onto a spike until you shift. Maybe add a semi transparent layer of the other map? (with its colors shifted as well to be visible)
2, the walls were you have to constantly shift and the spike stems were annoying to get past, with the former due to slowly moving forward, and the later due to how fast the spike sticks move.
Still, it was extremely enjoyable, and I would love for this to be expanded upon in the future.