A few bugs:
The Mega Disenchanter acts like a backpack, rendering it useless unless sold.
Every once in a while I will attack an enemy but it will show both -Damage and +Damage, even though it only lost HP.
The Walled Cave achievement is bugged and unobtainable (for me. I got all 20 wall pieces in one floor but nothing happened).
There is an enemy on one of the 5 star Tacticals that you cannot attack (Hit % is stated as "NaN"), and the game freezes if it tries to attack.
I really don't think "hard" is a fitting name for the mode. I get screwed any time there's an obstacle directly after a turn, constantly lose out due to some turns lasting several seconds, split after split after split after (etc.), and even at higher speeds, simply having more than 4-5 obstacles in one blue room. It really all comes down to the luck of the layout of the level as to how far I can go, and that's why I'd give a 4/5 instead of 5/5.
The reason gold can only be bought with real money is because it supports the game, and helps the devs keep this game running. You don't actually need anything that can be bought with gold anyway, it's all purely for looks(dyes, pets), or convenience(character slots, vaults). There will probably never be any other way to get more gold in this game.
In challenge 2, I can't even kill one of them. They move as fast as the one given to you so they simply surround and continue to pound on me.
In challenge 4, the dragon completely ignores the shield until the sword is destroyed.
In challenge 5, the range of the weapon given to you is barely larger than the ones of the enemies.
3/5. Should've made the arena larger, had some weapons with even longer range (Even if that made them a bit weaker!) and not had 'wander mode' make the allies dumb as bricks.
There are two main problems with this game. First is the timer. A lot of these types of games, including Cirplosion, require patience and timing. By adding a timer it rushes the player to quickly make choices, and only those with really good reflexes can act accordingly. Everyone else, it just comes down to if you're lucky enough to make a large circle. The second problem is the borders. They're invisible or something, because my circles break for no reason at all while I have it anywhere near the edge of the screen. I'd prefer if the borders didn't burst the circle at all, really.