This game has some really interesting concepts, it's a player vs player type of game, one needs to dodge the bullet shoots by another.
It's cool to see what kind of Danmaku you can DIY with Cirno.
Edit: Now the solo mode is there(by clicking the checkbox), here is the impression after playtesting:
It's definitely not the easiest game to play, since aiming a floating enemy within a short reacting time can sometimes be hard, plus your bullet might fire toward a totally different angle with just a mild miscount.
Your goal is to keep enemies away from your defense line, with only 3 lives, which can be used up very quickly if you are not careful enough.