I didn't want to wait that long for every round. Sorta boring because of that, and I stopped after the 4th level for too many tutorial levels taking too long.
Luck is most annoying part of this game. If it was less chance-based it would be fun. Doesn't mean "instead of random number, have attack always = number shown" because there still needs to be a bit of luck involved, but not this much.
Luck in:
1. Attack vs Defense
2. Cards you get
3. (for me) When my computer gets blue screen of death after 2 1/2 rounds.
 "Grid"){kind=icon}
 "Magnet towers"){kind=icon}
 "Mini space invaders"){kind=icon}
 "Minions"){kind=icon}
 "The Ball"){kind=icon}
 "- Music in Motion -"){kind=icon}
 "Square2Ball"){kind=icon}
 "Kingdom of The Wind"){kind=icon}
 "Darts 5.0.1"){kind=icon}
 "Gravity Master"){kind=icon}
 "Escape from really boring island 3"){kind=icon}
 "Monster Master"){kind=icon}
 "Space Adventure"){kind=icon}
 "Basic Space Side Shooter"){kind=icon}
 "SHIFT 3"){kind=icon}
 "Drawpad"){kind=icon}
 "Side-Scrolling"){kind=icon}