Simple game with a lot of cosmetics to unlock and not that much diversity and content. # stages (+Endless version for each stage). Player controls cute anime girl operating a defensive turret, protecting generators charging up super gun from attack of aliens. Girl's appearance can be customized with unlockable cosmetics. Turret has 5 slots for weapons and 5 for passive power ups, appearing for buy randomly after each wave. No plot, just relaxing (especially in later days when weapons are upgraded) shooter about mindlessly blasting enemies. I find asked price to be fair for what game offers
That game is short, no question about it. Around 1:30 to beat main game if you explore and watch every scene and probably around half of that if you know what to do and where to go. Puzzles are easy and there are enough hints around to solve every one of them. Still, it is a very good eroge with simple, but enjoyable plot and twist at the end (well, if you reach true ending). Most sexual content is unavoidable (save for maybe two scenes at the very end that can be skipped unless player goes for true ending) and do not rely on player purposefuly losing battles (as there are none) or minigames (again - none of them present), protagonist cannot die nor get permanently captured and imprisoned. It is in essence a walking sim with pixel art and sexual content (which is also fully pixel art, no hand drawn scenes like in most Kagura games titles). If you are looking for non grindy, short, enjoyable eroge title - get this one during sale.
Art is good, although not animated, but that's all that can be said about this game. It is increasibly short and there are no paths oter than main one. Technically there are two endings, but it all boils down to winning or losing final battle. Other than that game is just a series of arena battles with little interludes between. Enemies are not even attacking, either player wins an easy QTE or not. Oh, and some fights are impossible to lose, player controlled character will just stop losing HP. Buy at big discount for art, but if you look for good H-game available on GOG, go for Ideology in Friction.