I bounced off this one after having high hopes. I hate bosses with invincibility phases, especially when the only way to damage them is with a shot you have to charge by hitting them and doing no damage. And you missed that shot? Here's another 2 minute invincibility cycle. I hope you get enough charge to actually do some damage in between the next two. Every single basic enemy had to be carefully defeated so there was no flow and backtracking was awful. The skill tree restrictions were also annoying.