Wow, thank you for the detailed report! I'll fix the bugs asap.
About some balancing points:
The Tracker's skill is not that useful if you're used to not using flags as it mostly puts them in already obvious places
I see how it can be counter-productive to have the ability to flag cells if you adopt a no-flag style (which is rewarded), I'll try to rethink it.
Maybe an item that actually rewards patience/slow playstyle could be nice if there's supposed to be no rush (e.g. additional gold at full health)
More items that synergies with different playstyles will surely come.
Or perhaps making the level reward be either Fast sweep or Perfect game/Efficiency but not both
So that rewards are predetermined for each level? I think in the way it is currently every playstyle is rewarded with each bonus; of course if you focus on efficiency you might not get "fast sweep", but it's not excluded either so that you can get rewarded for that too if you complete it fast enough. In a previous version missed rewards were not displayed, but I think it's better to have them for two reasons, first you get to know which rewards are present without having to get them, second you can know by how much you missed the speed and efficiency bonus.
Maybe an item for decreasing reroll cost? Although that might make Gambler less unique.
That's already in the works with the 4th class (Merchant) :) it'll probably start with that relic.
Thanks again for the feedbacks, it really helps the development of the game right now!