Yes at the moment player power can jump quite a bit getting the right item through empowering the Nemesis. But don’t increase the difficulty for that as it’s too RNG and variable.
Instead, I suggest at early levels not making it possible to empower the Nemesis, but add a level of empowerment at certain points (e.g. after player level 30, then 50 (just suggestion), to keep the power level a bit smoother.
Other minor note, perhaps make shield charge have a limited range instead of being able to zoom the whole floor…