Here is an update on my work (sorry it took so long):

I have created my inventory and pickups. All pickups can be picked up and showing in the inventory. At the moment only health pickups can be used to increase health in the inventory and the weapons can be exchanged with each other in idle-animation. The inventory may undergo a slight change in the future, adding more pickups.

Weapons in idle-animation:

Today I am working on our enemy and ways to destroy "them":

Thank you for reading my post, hope to see you soon.