Note: game is at version 1.09 as of the writing of this review, so if it changes afterwards, take this review with a grain of salt.
Stability: No bugs that I encountered.
Gameplay: Controls are reasonable and responsive. Character movement speed is a little slow, but alright otherwise. There's no standard "jumping" ability, and instead you gain an odd "flight" ability early on instead, which is kind of weird, but eh, it works for this game.
Easily the biggest flaw, though, and the reason I'm very tempted to give this game only a single star, is the infuriating, downright impossible combat. In order to defeat enemies, you must first land a stun attack, followed by a second attack that actually does the damage. The problem is, the enemies are flying all around you and only intermittently become vulnerable- with seemingly no predictable pattern as to when or for how long they'll do so. Given that they are often well above the range of your attack (you can't aim up, only one side or the other), you're not even guaranteed to hit. This sometimes includes when they're right on top of you, for some reason.
And the damage you do, even with the first damage upgrade, is also pathetic. And keep in mind that a lot of times, the brief moment when they are vulnerable, it means they're about to attack you. And all too often, especially beyond the intro area, the timing window is so small that by the time you launch a stun attack, it may well be too late.
Nevermind that ghosts are always in groups and stunning one leaves you vulnerable to an attack from the other side, which pins you once you're naked (which will happen very quickly) and prevent you from doing the actual damage attack to your target- especially considering how briefly they're stunned, even with one or two upgrades to stun duration. Upgrades which are overly costly for the orbs you manage to acquire, I might add. And you can only get them in two key locations on the map.
Honestly, if it were *only* down to gameplay, I'd easily give this game a single star. It's that bad.
Aesthetics: The ghost designs are creative and interesting, and the animations are pretty well done.
Content (General): Seems to be quite a bit of it, but it's hard to gauge, due to the absurd difficulty slowing you down fairly early on.
Content (XXX): Again, the ghost designs are interesting and pretty well varied, and the animations are quite enjoyable. These two categories are the only saving grace preventing me from giving this game a lower score.
Overall: Good aesthetics and designs, terrible and infuriating gameplay with some neat ideas that are implemented awfully. FUCK the gameplay. It's terrible. Which is a shame, because with some tweaking, it could be fun. And maybe some updates will fix it in the future. For now though, get a 100% save if you can and spare yourself the irritation, because the animations and general aesthetics are the only thing this game has going for it.