Maybe items should not be physics objects?
Oh, yeah - I wanted to mention that - riding up an ammo pack/jumping on it felt a bit janky too. I'd def prefer them to be just pickups, not collidable items.
I also want to respawn the tower kit if the player falls with it because that can totally ruin the first wave for new players.
I actually quite like the fact the player has to be careful when carrying an item - I thought it was clever that falling down wasn't a game over but still had a cost.
Also low hanging fruit - multiple items can be carried but at the cost of reduced mobility.
Sorry for the back-seat-design - I tend to do that when I really like some idea 😁