Smooth gameplay. Me and my partner played this for quite a while with gamepad and she finally managed to beat the first boss, but it wasn't easy. Perhaps some slow motion could be used when there are projectiles coming from two directions? Staying near the edge seemed to be a winning strategy. I wanted to dodge projectiles all the time, but I'm not sure if that really worked?
Btw, your review of my game got lost when my broken zip was fixed.