I've previously left a positive review of this game after more than 24 hours of gameplay. I've now played more than 30 hours and reached the final level. This level essentially has pre-designed battles with very challenging bosses. You cannot see the characteristics of the bosses until you enter this area. You can ONLY leave a level once you defeat all enemies, and because you can ONLY save any changes that you make to your equipment or deck by finishing a level, this creates a huge problem:

Once you reach this area, you'll enter a battle to see what you're up against.
Then you will flee to modify your deck/equipment.
Then you will battle and fail.
Your changes won't be saved and you will start the level over again.
You will have to repeat all the changes you made, with a few tweeks to your plan.
After being forced to do this several times, eventually you will beat the first boss.
Then you will face the next boss and have to create a different strategy, and you will loose again.
You will need to MEMORIZE every deck/equipment change you set up for EACH boss, and worse; you will have to RECREATE EVERY SINGLE loadout EVERY time you fail a battle.

Eventually you will permanently quit the game instead.

How on earth did the developers not find this problem?! This is a HORRIBLE design failure. Just awful.