I'm enjoying it. To me it's kind of pricey for a shooter. And it's short, of course, like all shmups. There's only 6 chapters, 30-40 minutes for a single playthrough if you skip cutscenes. I assume that since you're interested in it you know the point is to play the game over and over to get high scores and beat tougher difficulties.
It's definitely unique. And not really bullet hell style since you can destroy bullets and have a rather large health bar. Some in the stream yesterday were comparing it to a mech/shooter combo.
If you love the genre, I think you'll be happy. If you're only a casual fan of the genre, I think you'll feel like you paid too much for it.