-Can I change my shadows element? Mine always shoot fire.
-Flanking shield enemies with shadow is fun.
-Hoping for more varied arenas, always kitin enemies around in a circle gets a bit boring. The enemies with poison mist break this pattern nicely, got to evolve your strategy when theres big poison clouds suddenly blocking and obscuring half the map. Keeps it fresh.
-Lightning link between me and the shadow that I got from the upgrades is cool and gives more meaning to the "move-shadow-here" mechanic. Adding more similar, but different, mechanics that makes you think of the shadow placement would make sense to me. I mostly kept putting him in the middle of arena and then running around. Didn't ever really find a use for him to be following me. I would rather call him some 5 meters behind me if I needed help with shieldy-bois.
I like the direction your little arena survival roguelite took!