As a modification to Slayerface's idea, we should be able to choose 1 astral item that we would like to keep after the mission. Also there should be a "retry" button for each plane rather than permanent astral energy. Then there would be some incentive to keep going, but it would also maintain the spirit of the game that the dev i think is trying to foster here.
I think the formula for idle gold is actually much simpler than people realize- one of the previous formulas was very complicated. Did a little timed testing and approximated this... (Auto g/s)X(Idle Power Upgrade Multiplier)
I love how at the end if one person is utterly dominating and there are 2-3 three left we end up having a dialogue that goes- "Kill pink" "No kill blue" "Not me kill red" "Pink is a bad color kill pink- don't kill us"...
I believe that chaos desert though not the strongest, is the easiest to play with the extra bolts, special decrease ability and burning- on the other hand though, burning hill isn't weaker if built right- basically make sure u get their combined attack with all the attack power boosts, burning with counter also has some uses