There's a rather fundamental "bug" with the design, which is that if you fail a jump and fall down when in the 'wrong' dimension, there's no coming back from it since most of the platforms are invisible, but you might still survive (e.g. falling down on the starting platforms). The only solution then is to try to commit suicide :(
The switching between dimensions could maybe be done through permanent portals or switches instead of pickups? It shouldn't really change the way things work otherwise, but it would allow for mistakes.
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thank you for playing and for your feedback!
The original idea was to have the pickups respawn after a while so the player could switch dimensions again if goes back, but I had some problems trying to implement the respawning in the engine so I had to leave it like that at the end due to time constraints. Changing the pickups into permanent portals would have been a better solution yeah! sadly I didn't think of it at the moment, thanks for pointing it out!