Pretty cool! The controls are a bit jank, you might want to explore the new input system unity has implemented, that way you don't have to look for inputs within your update frames. The hitboxes for the spikes seemed a little to big and sometimes jumping off at the edge would just eat away at the jump input (and maybe it is logically correct in code, but that's what it can feel like in platformers if you don't try and make mechanics easier on the player). Our game implements something similar, except it's within the same level and the duality is on the y axis, feel free to try it out!