I am playing with this mod now, and I have to say I don't like it. It's buggy as hell, and I am not sure I like the authors idea of "balance".
First, mutagens are useless now. They still drop, but, although I upgraded sword tree all the way, no mutagen slots to be found anywhere. I am not sure how you can justify removing a significant part of the gameplay like that, but there you have it.
Second, some skills (if not most) do not work as advertised. For example, health upgrades do NOT add health, like they say they should. Energy capacity upgrades do not add energy. I tried riposting about 50 times, not once did it work.
Third, armor and items feel pretty useless. At the end of chapter one most you could have is 8 total, best armor is +5 with upgrades. That means that on normal difficulty you die in two hits from a common nekker. And you sometimes have to fight 10 at a time. Dodge rolls are pretty useless in a crowd this size, and you can only block twice, before having your ass handed to you. Swords have been nerfed too.
On the positive side, the combat does feel more fluid. I died a lot faster with this mod than without it.