25100
First try on PC got me this score. Big issue with the android version is the deadspace on the left and right sides - i generally want my thumbs to be as close to the edges as possible, and touching those does nothing on my phone. Much, Much, Much easier with analog triggers on a PC.
The soundtrack is great in this btw, and the fact that it has different versions for the different phases (pause, enemies, boss) is cool.
Fun trick: you can reflect your own shots no matter what color you are, and they actually duplicate. So if I miss, I can catch the same shot and two will reflect, albeit faster. Bouncing these back and forth is a great way to take some of the leftover shots from the boss and clear out an early part of the enemy wave.