Stability: No particular bugs I can think of. Runs fine.
Content: Quite a good number of levels to play, with enough variation to keep it interesting.
Gameplay: Gets pretty damn difficult pretty quickly unless you put it on the easiest (basically cheat-mode) difficulty setting. Having only seen others play the original PvZ once or twice, I don't know how this would compare. It can get tedious later on trying to time and plan everything out *just right* to barely beat the level. That said, the actual mechanics of the game are reasonably fun when the difficulty isn't making you want to tear your hair out. And the difference between the easiest (ie cheat-mode) and the next level up is absurd. By the time you bump it down to that level, you must as well just press a button to unlock everything and skip the actual gameplay; on the other hand the next level up is still infuriating. The main problem is that after a certain point, your towers do far too little damage, considering how shielded so many of the enemies are- add to that the insane number of enemies flooding on to the map at any given point, and you might as well be trying to bail out a sinking ship.
Aesthetics: The graphics and sounds are decent enough. Nothing spectacular, but nice 2d stuff. Would be nice if the towers and especially the enemy units were a bit larger and more nicely detailed, but otherwise they're fine.
XXX: You unlock over a dozen animations after certain levels in the game. What connection they have to anything might as well be nothing. Don't get me wrong, they're decent animations, and I very much like the way the gallery is set up. And having something to strive to unlock is always nice. But I really wish there was some kind of h-content within the gameplay itself- which is honestly what I was expecting from this concept originally. This separation of the porn and the gameplay is the biggest disappointment in the game for me.
Overall: Not a bad game at all, and I ultimately would recommend it to people. But the h-content is a little underwhelming, and the fact that it's entirely outside the gameplay is, in my opinion, very disappointing. I rated this 3 but if anything I'd be more inclined to go with 3.5 or maybe even 3.75 if that were a thing. The frustrating difficulty spike after the early levels, the repetitiveness after a while, and the somewhat disappointing h-content are the main things that bog down this otherwise decent game.