This is a great game, but a few suggestions are in order;
Make the challenges worth your time and gold.
If you just play a couple of times (for free) the last campaign level you are in, you get the same xp.
If you are looking for gold, challenge is not a good idea as well, since you pay to get in and need luck on the dice just to break even. You can also get small amount of goods from campaign.
If you ned loot, campaign is not a good idea as well, unless you need one of the fixed loot from the rewards (even then you need luck on the dice) and you pay for it. There is no other way to get items if you’re stuck on campaign, good luck.
My suggestions for challenges:
- lower the price tag a bit. Not free, but maybe 50 gold for all challenges ( not scaling) and make your last finished dungeon part of the free rotation, all I get for free is the first dungeon, it gets old.
- combine the rewards of the dice, not make the player choose. It is very frustrating to kill the tier 2 boss, kill 7 or 8 room and walk out with just 50 gold or a useless tier 1 item you already have hundreds of.
My suggestion for rewards would be loot chests, fixed items (more cards than chests) and gems, all sprinkled in the dice rolls. you get all the dice, not choose one. I feel I get screwed almost everytime I enter a dungeon. Make it worth it, right now it is better to just farm the couple of rooms I get to repeat in campaign mode.