I was working on a mini game called 'Money Wars'
Its simple. You get money, then you spend that money on upgrades like defense. There are two teams. Red and blue. Both teams will have a golden brick that you must defend. If that golden brick is destroyed, your entire team loses. Of course you can spend your money on defense which places blocks that the other team can break to protect it. If you die you lose ALL your money. You can also spend your money to get to certain areas which have money spawners.
Things you can buy in the shop
Weapons
Defense
Money Spawners
Idk
Will edit this post with screenshots of the idea, if you don't really understand.