I don't know why my review was deleted? It is impossible to upgrade your stuff. The upgrades cost about 500 coins and the difficulty increases fasted than what you can earn per level. If you win, you get all the coins, if you don't you get 20-30 coins even though you made 200-300 coins in the level. You have 5 hearts, so it takes way too long to get the coins you need to upgrade 1 thing out of 5 categories. Started out fun, not fun anymore. In order to get the memories etc you have to win.