As usual, it's not nearly as bad as many of the comments would lead you to believe. The only characters I would really describe as "flat" are the villains at the end, which makes sense given the story was being axed. Maybe the dragon king in the early chapters as well, though he gets some attention at the end.
But it's not an amazing story, either. It had some good potential, but it would have needed more time to develop the plot.
I will say it could have done without the "clueless MC" trope at the end, though. If a grown woman keeps crawling into your bed at night, it's not because she's cold.