User blog comment:MakitoMizushima/Do you have any feature requests?/@comment-27137913-20151114083116/@comment-32243366-20160805073237

Now there are coins, space gems, gold, emerald, and obsidian. In the future, the Lab will be added and you can collect WAY more stuff, like mushrooms. You can even create your own items in the lab, like potions! :)