Played it for a while and some things stood out:

+ Graphics choice for this kind of game is excellent.
+ Enjoyed the music and it's variety. The way new enemies enter the scene is amazing and the best part of it all.
+ Nice variety of enemy "nodes".
+ Love ability switching with mouse wheel/keyboard. Super intuitive.
- Poor tutorial. It's hard trying to dodge shitload of bullets and try to read text on the screen while trying to figure out what abilities it's talking about and how to use them. Too much at the same time.
- Invincible enemies are not that nice. After first restart or two it becomes apparent that sometimes you simply MUST dodge and should not try to kill it.
~ Massive spirals from invulnerable cubes makes me dizzy and disoriented.
~ Might be a steep learning cure or just a game not for me.