Yeahh... lack of play testing got the better of me, but thanks for playing!
Also if your wondering the demon lords stats are:
vitality - 8
attack - 8
defense - 8
speed - 8
but not intelligence (enemies don't have this stat)
"technically" the boss is beatable with sheer luck, but judging it now i made it too hard, even if you don't include all the bugs. In the future versions it will be easier, but not by much.
Also the reason for the unupgradable stats is probably because i made the upgrade system semi-luck based, not the smartest design choice now looking at it, i will also revamp this in future versions.