I really hope this isn't "complete", because this seems to have had a lot of effort put into it for a literal five-minute runtime (I thought people were exaggerating - it really is ~5 minutes).
It doesn't quite hit my ideal-game trifecta (Has a ☑Female Protagonist and Cute Art in it, but unfortunately for me, no NC/Sub Content) but I found what's there to be pretty hot anyway. Though, as far as I'm aware, it's just four stages, three H-Animations and one enemy type (which seems to get a little more competent each stage, but not much). The animations are pretty good, with decent audio and voice. There's no gallery, as far as I can tell, but the animations that are there are easy enough to unlock (different one at each stage of powering up, which is like a minute's worth of play to get to the most powerful stage) and only advance towards climax as you press to progress the animation to the next stage, so it's not too hard seeing what you want.
The gameplay itself is basic one-attack button stuff and the H "finisher" - not exactly complex. It could maybe do with a little bit of tweaking, but I didn't find myself getting frustrated with it like with other side-scrollers; The attacks seem wide enough to not require pixel-perfect manoeuvering, and the character is fairly responsive to movement when you are out-of-range. Probably the worst bit of that is the backgrounds not quite matching the out-of-bounds areas in places, but it's fairly minor.
There's a few underwear variations to buy, some taking quite a few completions of the game to unlock, but they're (mostly) only visible during the second powered-up stage, and the jacket never comes off, so... I dunno, unless you really enjoy the gameplay, I don't really see the point. Though it does hint at this not being complete, maybe?
The other character's reaction to your H "finisher" got a genuine laugh out of me, and I guess it gives an in-universe explanation for why you don't get dog-piled by all the other enemies in these sorts of games. I quite liked the small humorous elements in general - there's not so many that it's distracting from the erotic stuff, but it keeps the game feeling light-hearted. Special shout-out to the opening song, too. I won't spoil it, you have to hear it for yourself.
I'm giving this a 3/5 for now. The only thing knocking those last two stars off is the chronic lack of content. But it's short and decent enough that I wouldn't dissuade anyone from playing, just bear in mind that there's not a lot to it.