Thank you soooo much for playng, beating the game and submitting a really in-depth review!!!!
When you re-spin the wheel you are supposed to be able to choose wich element to use (as shown in the second screenshot, you can stop the wheel!), maybe there was a bug but we've designed every level so that if you do everythign correctly you shoudn't have to spin more than 3 times (exept for the last level)
The darkness and water I agree are too hard in comparison to other effects, but once ou get the "quiet" poewer you can stop them!
The elementalist is supposed to be a foe that you arn't supposed to fight unless you are really powerful (or desperate :) )
The only change done by "easy mode" is the iframes change, it makes a bit easier without changing the combat
The attack is a bit slow, it was intended to be a running attack, with a quicker version when you are standing still, but I ran out of time :)
The other ending is nothing much, don't worry about not replaying (there is not much replyability, only thing that can change is the level up) I completely understand (the other ending is a classic bad ending where you repair the wheel, to know how to unlock it you pick up the translator hidden in the first boss arena and the wheel literally tells you what to do)
We were able to put this much amount of content mostly because we are using GameMaker, wich is a really quick way of making games (and I reused the code from the bosses for the later enemies :) )
Again, thank ypu so much for playing, hope this clears everything up, if you have more questions ask away!