You should fix the coins when it's stacked together, the value should be "stackable". Also gold deduction whenever you die or something.
Viewing post in League of Pixels - 2D MOBA comments
My recommendation is that the skill should resemble like leaves and the ultimate should be mud. That would be awesome. Kinda looks like this: http://prntscr.com/fo6b56
Can you vary Champ's regeneration speed? Just like their individual atk and movement speed. You should've make a hero that's tanky because of high regen but poor in attack and movement speed. Thanks