great game. You should add the option of saving up the coins you get during battle, outside of the battle so you can buy special upgrades/items e.g. money magnets, skins
Thank you so much for playing! The idea is you have to collect coins to level up and then choose/buy one upgrade, this way we can create replayability. Every time you play you can create and test different builds. But we are testing a lot of things yet and any suggestion and idea is welcome!! Thanks man! :D