Thanks for playing!
Heroes have the health and coins values. Than hero fight he deals damage to some number of enemies (depends on weapon) and takes damage from all enemies. If weapon has a chanse to explode than hero dies instantly and some enemies takes damage.
Enemy stats are not shown in the game, only damage thay takes
Not sure about the money, but it's not so obvious that you can click on the store slots to increase the price.
Probably should make tutorial next time)
Also if you really made it endless than you win! That's the point)