The Giant's Treasure is a porn game that is neither good at being a game, nor good at being porn. The reason I give 2 stars instead of 1, is that there is a lot of good work put into this, if the game itself is boring. The artwork is fairly decent and the standing images that are animated are nice to look at.
To say this is a slow rolling game is an understatement. The gameplay loop consists of two main parts. The first is a pseudo tower defense portion that require you to spend resources to build artillery to defend one of the last functional bases in Japan. The second part is a psuedo Survivors style component where you'll be spending most of the game playing. You build a team of magical girls to scout various locations, defeating enemies for dark essence, breaking building for resources, and reaching a designated mark to gain a companion or blueprint.
This all sounds compelling at first, but after the first area or so, you quickly realize that this game will force you to repeatedly grind an area to dust just to make the tower defense portion manageable. Every improvement to your base or magical girls requires either lots of metals, or special gem drops from certain enemies respectively. The number and types you have to find scale so fast that you will spend hours repeating areas and hoping that a particular monster drop the one gem you need to promote a magical girl. You will spend hours running into enemies as your main way to damage them, with only about 5 abilities to choose from in a team of 5. The abilities are set, and only a few are worth using. These abilities only improve with the promotion level of the magical girl.
This game gets grinding wrong by strictly pumping up the numbers and giving you nothing back for it. To upgrade your magical girls, you play a sort-of mini-game where you tease the girl with various toys in an attempt to make them so horny they fall for the dirty old scientist's dick. I haven't experienced a loop so one-dimensional that I was hoping to skip the smut. This is the only portion with porn mind you. Like the rest of the game, you get nothing for experimenting, and instead are expected to do the same things over and over again. The girls don't have any truly unique lines or thoughts. Every "broken" scene is generic to the point the girl's face doesn't even show, and simply uses the same body. The animations for the toys elicit the same reaction no matter the girl. And this is all you have to look forward to after the bland gameplay of simply running into enemies in the same looking field over and over.
Everything about the construction of the game screams padding. The grind exists as an artificial wall to shield the fact that there's not a whole lot of reason to play this game. The tower defense and survivors style mechanics are shadows of the real thing, abstracted in a way that utilizes the worst parts about them. The porn is canned and uninteresting with no real payoff. There is no fun to be had here, which is a shame because there is something here, it just feels like nothing, and that is one of the worst offenses a game could do.