Definitely needs quality setting
Game's fun, a bit addictive I must admit, but there's one big problem: you can't set the quality. I'm playing on a 4 year old computer which is still able to run most of the recent games on NG in High quality without too much trouble, but this one has too many animations to be running smoothly IMO, like in the seventeenth zone where you have to be fast and spawn many tentacles: gets laggy like hell and by the time your action gets executed, it's obsolete.
I think you should consider an animation switch, I mean that the player should be able to chose if the tentacles and "pulsars" will be animated or not, for instance.
Hope you'll read the review, and good job BTW!