I’ve started up this top-down shooter project. You gather XP by killing enemies, but there’s a twist. When enemies drop xp, they’ll drop it in a nearby XP crate. The more XP that is in the XP crate, the bigger it gets. You can merge crates together and they’ll get bigger. Merging big crates with other big crates will result in a much bigger crate of XP because extra XP is added on when you merge big XP crates together. Or you can just use them for cover, either way.