There should be a cap button for augments, maybe with an option to siphon off idle energy to keep it maxed, because If you put too much energy into a single augment, then all the excess energy is useless, and I would like to know what the cap for my augments is, even if it changes constantly.
You should be able to aim at the ground, like with the fire shrooms, because then you could shoot a fireball at some grass to ignite enemies out of reach, or a ball of lightning at the water.
I wish you could see total gold/money per second, because having to pause and restart every job to get an idea of how much money I make is too annoying.
Occaisonally, the tunnel will go blank and get stuck in a loop, with no obstacles, and those are just about the only way you can get the hard badge.
I rode one to ~930 and then reset 40 times until I got in one again.
My recommendation for the final arena fight is to ignore the dark zoul untill the end. That way, you only have to dodge 3 fireballs when killing the other bosses, instead of 8.