After each lvl there should be a upgrade shop with stuff like: Faster Forming Hail, More Damage Per Hit,Stronger / Wider wind, more money per kill, and Higher time. NEEDS A SANDBOX MODE, everything else is AWSOME!!!!!
when lvl up should add like 500-1000 gold, 1-20 WBs depending on lvl (like lvl gets 1 WB etc.), + 10 to your max energy, and +2 card slots for your deck. Also battles give more xp and gold
More gold and More xp for a mission, arena battles award gold and xp, you get atleast 1 WB for a achevment, and gold and 2 WBs for lvling up.........I Have Spoken