Apparently, there's a release of this game that completely reworks the graphics and makes the game much better overall. Don't be fooled; that's not the version of the game you're getting through Steam.
In all truthfulness, I can't think of a single bit of praise to give this game. The sound is terrible, the music sounds like it was made in Garageband in 10 minutes, the HUD and graphics quality is poor, and the enemy design is quite abysmal. The game does contain a unique gameplay mechanic - you can commit suicide, but you retain your score multiplier (crucial to setting highscores). Unfortunately, this seems like more of an excuse to get around the poorly designed enemies that flood the screen or fire too quickly for you to be able to stand a chance.
I don't think I have anything else I can say about Bullet Candy. Unless the developer's rework is brought to Steam and proves to fix the multitude of issues this game offers, I would avoid this game.