Great game, great art! Wish there were some higher difficulties! There could probably be some balancing e.g. needle on the shuffling stages & bombs with double blast power make short work of the bosses.
Would be cool with a counter that compares your number of coin returned with the minimum possible.
Or simply give the lowest number of coins that can be returned in each transaction. Some way to compare your choice to the best possible choice if you want as few coins as possible.
But that might ruin the "zen" of it, really cool game!
