The game save your progress , but the creator is VERY STUPID ! :) but nice game... with STUPID CREATOR , WHO DELETE SAVES! >.< At every update your save is BYE-BYE! :)
If you are biological on heroic or challenging difficulty, after you defeat mayor you can re-spec and put all attribute points at speed and Ability: 4 Corrosion , 1 Toxicant Form, 4 Shadow Blend , 3 Agile Exposure and the last one 4 Withdrawal...Equip items with Speed ...and use skills in that order and your attack will be +20.000 :)
Thank you very much !!!!