Really fun actually. It's very nice looking and runs well. Got to level three so far
Because many have mentioned graphics I have to point out one of my contributor J-P Metsävainio. My fellow-countryman with excellent skill of taking those amazing looking nebula pictures. Every level is composed from different astro photo. I can't thank enough him from lending his masterpieces to my use. More cool images http://astroanarchy.zenfolio.com/
There is two main features witch make that look. Everything is motion blurred with background image. This is easily done with lowering alpha value (to 0.7) and disabling screen clearing. Secondly every moving object make particle effect. When you combine these bot you get smooth motion but sharp static edges.
Slowly moving bosses still annoy my eyes but I think real players just can't see that. There is much going on when you have to bounce green rect, avoid burning boxes and still try to aim to boss. There is just not that much time to stare boss and try to find some graphical glitches.
Still I think this will be my last project without real graphical designer.
How about music? Did you liked William Cushman's piano melodies? I have listened that piece of music over 200times and still not bored.