Ending is a little hurried; but at least they didn't needlessly drag out the final fight with 10 rounds of "this isn't event my final form" and/or "I guess I'll fight seriously" and/or "don't look down on me!".
Otherwise, a very satisfying read. I enjoyed this one.
This seems like it's probably going to be absolute garbage; but there's just enough actual plot over self-insert wankery at the end of ch2 to keep an eye on it for now.
I'd like to be surprised by this, but I don't have high hopes.