The interactions are the main draw, but the gameplay just sucks so bad. The board game mode only has 1 board, and you need to play through it with a character to be able to use them in the RPG mode. So, to have a full party of 4 characters, you would need to play 4 runs of the board game. Then, you'll eventually reach a point where your characters are too weak to be able to make it much farther in the RPG, so you now need to play the board game a bunch more times with higher rarity units, and it's the most boring gameplay loop I've ever experienced.

Luckily, the micro-transactions are entirely unneeded. They exist, but it's fairly easy to get enough coins to get more units.