Well, this was a thoroughly mediocre game. Sure, the art is nice enough and the animations are decently hot and all that jazz... but...
Well, it's nothing special. The gameplay doesn't really have anything that makes it stand out, especially when there's stuff like Night of Revenge out there which is way better on every level, from H-content to gameplay. It's just very basic side-scrolling stuff, and the special abilities aren't particularly creative or interesting either. That's leaving aside the fact that you probably won't even use most of them anyway... also, the potions are OP as all hell. Full Health? Invulnerability? Then later they do damage while making Luna invulnerable for even longer? Ridiculous...
For the entire duration of the game, I wasn't seriously threatened by anything and never got seriously close to losing... and I'm really bad at these types of games.
This is obviously a bad thing for a game that's designed around rape on defeat, and without a mechanism to instantly lose HP either. Good thing that at least everything gets unlocked when you beat the game, there's that at least.
Also, screw that butterfly thing. That was clearly done to artificially extend gameplay by getting you to run around areas you've already covered before. The least they could have done was mark them on the map if you found them beforehand. They clearly did it with those color symbol things that needed to be spun around, so it they could have done it with the butterflies too as a reward for being thorough in your 1st run-around through the map.
Not that they're particularly difficult to find during said 1st run-around. The game just doesn't have that much in terms of side-routes and whatnot, so you'll probably see everything before you need the butterflies and needing to go back for them will feel utterly annoying and tedious...
All in all, poor game design.
I'll also take points for not giving us an animation and scene for the demon girl's punishment, just that one small drawing in the corner during the credits of her getting fucked by the dragon. Utterly disappointing...
Well, I suppose I shouldn't be particularly surprised with a game of this size... but it's still annoying...