Your scrap meter will fill over time, when it reaches 50 you can upgrade your endo! Your hunger meter will decrease over time, when it reaches 0 your endo explodes. Press "Feed" to use 10 scrap to increase hunger by 25. Press "Upgrade!" when you're ready to upgrade your endo.
Since this is an early demo there is only two endoskeletons. Trashed Endo and Basic Endo. You will start with one of 4 Trashed Endos. I will add a shop function and an endo catalogue function, as well as an endo combining function in later versions.