Phone [game] Hallo Spaceboy! (shmup genre)

Hello, I recently published my first android game at google play, and would realy like some feedback. Just try it and share your thoughts.

I have a big experience in gamedev, but all my games exist only as Starcraft 2 mods. For example, I created a pretty popular Mines and Magic mod there.

So, there's the google play link to Hallo Spaceboy Lite:

play.google.com/store/apps/details?id=com.Zolden.hallo_spaceboy_lite

Go, check screenshots there.

It is vertical Shoot'em up genre. But it has some featuresm that make it unique and fun (I hope)
- very balanced gameplay, it's challenging, but not too hard, must be fun to complete levels
- physics involved, so you can collide with stuff, and it feels real
- interesting story
- music is heavily correlate with the story, and translates emotions that present in the dialogs between characters

So, dudes, hope you check it out, I realy need some feedback, cause I have huge plans on further games, and want to feel, what audience appreciates. Thanks in advance.