todo:
- make it so you can convert other useless materials into materials you want. (like red gems which don't matter once HP is max)
- give the player a Heal "upgrade" that just restores their hearts. Have it use red gems or something
- add another level to the AOE upgrade to make it cover a crazy big area
- On later depths, the "mining speed" resource stops appearing, making it a little painful to get it fully upgraded
- Add a proper "this is the actual ending" screen so players don't keep playing, searching for more that isn't there
- Scale the backpack upgrade to be more significant at higher levels. By the end, my backpack was still filling up way too soon
pretty enjoyable though so far