This was really fun and incredibly polished. I especially like the music and sound effects. It took me a while to get the hang of controlling the two sisters, but once I got it, the I had a lot of fun blasting the Doomer and his minions. The reflection mechanic is also quite clever. Well done!
If there was one thing I'd change, it would to maybe remap the heal button on the gamepad to one of the triggers instead of the A button. That way, the right thumb wouldn't ever need to leave the thumbstick during play.