hey great game its a gem really!!! idk if its a skill issue or not but i really have problems like unlocking/using the hidden elements like void stuff..
could u explain it more?
I'm not the developer, but the two elements that you seem to be talking about are Aether and Void, which are going to be added in an upcoming update. The update got postponed because the developer had to rewrite the majority of the code for optimization.
Void is currently unavailable in any aspect, but you can play an incomplete Aether element if you change into the elements quickly in sequential order. And that would be Fire -> Earth -> Water -> Air. You do have to do it rather quickly though.
If you happen to be talking about synthetic elements (nuclear, rubber, paper, music), then I believe those are ideas the developer had, and might not actually make it into the game.