This boss is tricky and mikily gave the good answer.
In the 0.5 (a shop item wilol help you against the Boss)
Thank you for the bug report I will see if I can reproduce and debug it for the next version.
Viewing post in Tower of the last Demon (AN ABDL RPG) Ongoing comments
I also forgot to mention another bug, although much more minor
The number of toy coins stays the same during saves, like for example, having beaten floor 1 like four times and having 400 coins, if I reload a save from before I beat the first floor I still keep those coins
Tbh this is kinda nice for checking everything out during an update without having to grind after every save reloaded, but I think I should still mention it
Cant wait to play 0.5 when public by the way. If I had the money to support you, I would.
Thank you very much for the bug report, I think it's something that will be really hard to correct in the final version of the game but I will see it's in a far future.
Yes the new one will be realese when the 0.6 will be done (begining of november), Expressing that you like the game is one of the best way to support me, because I can see that people like the game and help me to continue to make more :)