TLDR - you're better off browsing sankakucomplex, danbooru or rule34
First off, all art in this game is AI. I wouldn't mind too much if there was more consistency and imagination in the different characters.
Anyway, this is an "anti-gaijin" eroge. By that I mean that there are several portals in the game that, in order to pass through, you have to answer some asinine japanese kanji question. Despite being RPG Maker, combat is a trivia quiz. Answer right, you hit the enemy, answer wrong, you get hit.
Optimization is complete shit. I know that RPG Maker games aren't known for running smoothly, but the author managed to make the very first map a fucking abomination in the performance department. Seriously, whenever you move a tile, there's some sort of freeze/jerk instead of a smooth map transition. If you ever played very old DOS games like Commander Keen, you'll understand what I mean. There are many maps that are shit like this.
Music is "interesting", in the sense that the author felt the need to pick the most random stuff for certain areas. One place is the typical RPG Maker stock music, the next is some epic celtic thing, then it's fast heavy metal guitar for a puzzle, followed by combat with some fantasy-j-pop thingy with vocals. Aside from the stock RPG Maker music, everything feels very out of place, especially regarding what's on the screen and what you're doing.
Sex scenes are very lackluster, it's one image/pose with each of the fuckable girls, with one variation being cum flying everywhere. Not even different facial expressions, just the very bare minimum. After that, you're forced to sit thru a 12 second long video, which I guess says "Impregnated" in japanese, then you're treated to the scene of the girl you've fucked giving birth.
The story is some stupid shit about demons being opressed by humans. How do you tell a human and a demon apart? No fucking clue, they're all drawn/generated as typical AI animu slop. There's a limited quantity of kemonomimi girls.
Right, the story. So, opressed demons, you control a futa demon gal who has special cum that makes anyone she fucks instantly pregnant and give birth. After you join the special knights order of the humans, you're tasked with making hundreds of children on the side in order for the demons to have an army to overthrow the humans. Neat idea, no clue if anything like that happens.
I mean, I'm on the 4th mission now, but I really don't feel like wasting more of my time just to see if something interesting actually happens, because I'm 99% sure it doesn't. By something interesting I mean a small scene with lots of "demons" overrunning the city and knights.