Many thanks! \[T]/
Glad you enjoyed the motherboard system <3
It had to be simplified a bit to fit the Survivor setting we picked for the jam, which meant hiding some menus and the option to remove pieces sadly (as they would go back in said menu).
Unfortunately, the partial invincibility of the gun enemies comes from a small bug we didn't manage to fix in time...
About the metal - when you die the first time the game should bring you to the main menu, where you can go to the "Upgrades" tab and reinforce your mods permanently for the next run. We don't show it at the start because you have no metal for upgrades anyway.
Thanks again for playing!