Is your "How does your game fit the theme?" description for this current game? I feel like it's describing a different game, but tell me if I'm wrong. And also one of the screenshots are definitely not from Until Zero unless there's an easter egg I don't know of.
Oh yeah the gameplay is the simple lights out puzzle type but slightly different that has (like you said) easy rules but lots of mastery in the form of knowing little tricks to get specific patterns of stars the way you want. I personally won't play everything, but I like how every constellation exists if I want to. I personally just picked the cool sounding ones on increasing difficulties then gave up on the difficult ones. (I have proof of this, I named my username after my game for advertising you know)
Unlike other puzzle games I've played today, this one introduces everything in the tutorial, and doesn't have any gimmicks. There's only one type of star and all of them have a max "charge" of two (which means stars are ternary which is a useful thing to figure out to help solve levels) (also I figured out the order of clicking stars doesn't matter, it all ends up the same no matter the order)