Fantasy Adventure

I'm not sure why, but I can't win anymore. Even on floor one, the boss has like 500k hp (and sometimes upwards of 700k). I beat the first 3 or 4 levels (I'm on floor 2) but I haven't won a game since. Every time I upgrade my heroes and think I might be able to win, the boss is suddenly way more powerful. Also, the sword skill button in the bottom right seems like it makes a wall around my main hero, but it does nothing. The monsters attack right through it.

I'm assuming this is a bug of some kind. A mix up/cross between challenge mode and regular mode or something, but unless it's fixed I can't recommend this game. It has a ton of potential, but it's currently unwinnable.

Don't buy even if on sale.
Super short and not really an idle game at all.
Barely any options.
Wasted a dollar on this....