As you play you will pick up apples 🍏 and eggs🥚 these are things, you will also gather rocks🪨 and sticks🪵 these are stuff.
Upgrades have several levels and the costs will increase on an exponential incremental scale.
Things:
You can use apples to recruit more townspeople to help you work. this will increase your speed with gathering and defense since more hands make a lighter load.
You can use eggs to increase your strength, allowing you to carry more things and build better defenses.
Things can be used to heal you during gameplay. Apples for a quarter life eggs heal half life.
Stuff:
You can use sticks to increase your gathering quality getting higher yields of stuff when you gather them.
You can use rocks to build bigger and better walls when combined with sticks.
Stuff is also spent during gameplay to make walls and defenses. Rocks make walls and sticks make defenses.
Armageddon:
This is a special item that will wipe out all the enemies on the screen and clear the wave as they enter the screen. This comes at a cost as it slows the spawn of resources for the next wave of enemies.
This is not usable on The Big Boss Guy.
Each purchase cost more and more resources and you can only hold one at a time.
Additional features:
On this screen you can check your gathered resources in your Inventory backpack.
Buttons will have a mouse over highlight and a clicked on highlight to show they are interactable.
The upgrade icons will have a floating number in the center of them indicating what level upgrade they are currently at.