After the 2 first fights boss appear and we can't win versus him. Tutorial said to end the day but how?

Hello. What is supposed to do the Amplify upgrade option when in dungeon upgrades phase ? Graphisms let think it is an upgrade of some stats of a monster, but the goblin i use it on (two times, on two consecutive days) remains at her base strength of 7 (8 at day 4). And when i choose the Add Trait option, the Trait is not added to the Monster. In both cases, however, money is taken. Damn capitalist dungeon... Have a nice day....

The game just stops when the thief drops a card and i have to close the game (it will restart that day i redo every fight again)

So i was playing the second day and after about 3 waves i got this annoying Cleric who kept healing herself up from 0 to 0 and that would just not die. I took a picture but i don't know where to share it lol

Is there save? I played the first level and leave when I came back I had to restart from the beginning...