Goblin's Shop funktioniert nicht

In Goblin’s Shop, the player is a goblin who has been bullied by humans and he always wants to get it even.  Then the idea of opening a shop occurred to him, so he decided to sell weapons, armors and potions to other monsters.  In the game, the player has to undertake adventures with his customers constantly, to acquire better crafting materials.  This is a pixel-art simulation game in which the player runs a shop, together with RPG adventures.  To take revenge against humans, he puts together an adventure team with other monsters.  Goblin realizes that he is too weak to beat any human soldier.  During any adventure, the player might face fiery counterattack from human soldiers, so it is imperative to craft better equipment for customers, and then the customers can kill humans more efficiently.  The ultimate goal is to attack humans’ castle and gain victory in the end.