Clicking rapidly on two different tab at the bottom causes the screen to go black. It's easily fixed by going to a different tab, but you might still want to fix it permanently.
It's odd that after getting 20% progress five times, I still need to fill the progress bar one more time to actually level up. Might want to change how that math is handled by the game so that 100% actually causes a level up.
There is no point to having the money display show "7.53K" when it could show the actual full value with the same number of digits / letters. Switch to the "K" display at 5 or 6 digits.
The various attributes aren't very well balanced, or so it seem to me. Cunning-based builds look to be the best since it ramps both your damage and your casting speed. The attribute that boosts casting speed should probably not do anything else at all.
It would be nice if you could choose strategies for which of multiple prestige layers to automatically prestige. Personally, I have a suspicion that a boost of several orders of magnitude on layer 1 may have a bigger impact than a x2 on layer 3, but what do I know?
I wish there was only one prestige screen where I could see the current levels and points for all available layers at the same time, rather than having to click back and forth all the time to see which one needs the prestige the most.
Some suggestions: Please make buttons for each prestige layer that toggle autobuyers with just one click. Also, I would like autobuying via manual prestige to work while automatic autobuyers are turned off. Finally, I think it would be nice to have a "surrender" button on the main screen that immediately kills your entire party and restarts the dungeon.
I don't think I like the change of healer units compulsively healing to full health. That tends to be pretty wasteful in terms of actions when you're only missing a sliver of health. Maybe there should be settings to control this and other aspects of AI behavior.
It would be nice if you could heal between battles. Maybe if you defeat the enemy with actions unspent, those actions are used to heal your frontliner without any extra time spent between floors? (If it took an actual turn, that would probably make grinding more inefficient in many cases.) Why aren't we just automatically healing to full between floors anyway?
Could you make it so the Observe / Dissect / Preserve button remembers its setting, at least during a session? It's pretty annoying having to put it back on Preserve every time I quickly go check on something else for half a second.
Could you add an upgrade that reduces the turns needed for the maximum bait cost reduction? It could be a maximum of 9 and reduce the turns needed by 30 each time, or something. I'd definitely spend a bunch of moon lenses on something like that.
There is some kind of display bug with the total perk bonuses. Twice now I've taken a second perk that gives +1 to an attribute, and in the summary it shows a +0.1 bonus instead, much smaller than the 0.25 bonus from the first perk before it. I've tried this both with the +1 ichor gain bonus and the +1 career speed bonus. This was also in a challenge, in case that makes a difference.
 "Idle Quest")
 "Idle Monster TD")
 "Starfleet Wars")
 "Idle Sorcerer")
 "Idle Harvest")
 "Incremental Adventures")
 "Idle Hamlet")
Reload the game. I just changed it to work that way in today's update.