Cost per play in the adventure is too high, or rewards are too low. You should at least make back the cost of play if you complete a level, regardless of how many stars. 5 cards in the draw pile for online play is too low, need the option to play with a higher draw. I've played multiple games where the 1st player was able to empty their draw before anyone else got a turn - the likelihood of this lessens with a 10 or 15 draw pile.