Looks like an Alibi game, play like one too (not a good one but still on par). Basic "tower defense", where you only have your girls and traps to defend.
Girls, you have one at the start, then more comes with stages.
Traps, simple, you put them, some you have to be activated, some not, prefer the latter.
Each win, you get to train, collect iron parts or harvest plants, prefer the iron parts.
Do i have to lose to see anything->No, if you get to the end, you will unlock everything (You could see them by playing and losing, but it mean losing quite some time.).
How do i finish this game->make your girls face ennemies, when you have more than one, one on each line is the best, if there is one ennemy on another lane you don't defend, just swap the nearest girl.
Each win, collect iron parts 3 times, priority of purchase are makibishi (spike traps) everywhere, then barbed wire on fences, then uppgrade girls weapons (You absolutely don't need anything else, as you passively collect enough plants for the blonde bullets). Talking of the blonde, she's the weakest, so when you have the 4 girls, make the nearest girl to her lane come to hers to help her. And voilà, you will win the game.... after a little patience.
Is it good ? Meh, animations are too basic, some are recycled between ennemies, climax of the dead looks like someone is putting a 30.000 volt stun gun somewhere decency doesn't allow me to explain.
Gameplay is quite absent and not really entertaining sexually speaking.. I mean, i could finish the game by alt tabbing when gameplay was on to browse on this magnificent website, so you don't need great reflexes.
Can't give the save, as i didn't found it with a quick browsing of my files (And i'm quite the sloth devil.. so i'll blame my laziness.).