At its core it's pretty good game, but with some annoying problems.

Firstly, it's too long. By the time I got to the last level I wanted to be done with it.

The bosses are pretty boring in two ways. Firstly, most of them fell into one of few templates and are almost exactly the same. Secondly, they take pretty long to beat (although I should probably use more specials) and even if challenge otherwise isn't that big, couple of small mistakes can make you go through the whole thing again.

Also that one part where you need to run quickly is just the worst. The controls for this game were just not made for this.