In Arcade mode it is not possible. In Roguelite mode when you find an orange room, there is a device on the left side that allows installing all already unlocked upgrades. If you choose shield and install it on your right hand, it will automatically be removed from your left hand and placed on your right hand.
Ahh, thanks. At least it's a mistake I'll only make once!
Loving the tension and feel of the game. I've jumped out of my skin several times when encountering a robot I didn't expect. Brief forays outdoors really add to the atmostphere, with the droning of the large transporters flying overhead - and launching robots at you while you're on a tower, too!
I plan to add a simpler gameplay mode. The whole plan is to separate checkpoint/run based gameplay setting from gameplay complexity making it possible to play simpler gameplay run-based (permadeath).
Another thing that is going to happen is extended play/endless mode. This will enforce current roguelite mode rules, though. With map, additional devices and permadeath.