Upgrade shop

The upgrade shop is the game's "real money" shop, as well as its progression system. Here the player spends gems between rounds to unlock permanent upgrades for their character.

Overview
The upgrade shop is accessible from the main menu and gives the player access to certain advantages:
 * Base stat increase – Limited upgrades that makes the player start with higher base stats.
 * Items – The player buys potions and other items that he can equip when starting a new game.
 * Skins – New player models.
 * Gold increase – Increases the amount of gold given by chests.
 * Chest Upgrade – Decreases the number of taps needed to open chests.
 * Gem Chance – Gain a % chance to receive gems when completing a round.

Details
 

These upgrades can only be bought once, except for the consumables. All upgrades stack, and give their bonus in addition to previous upgrades of the same type.