This was a cute game. I knew going full well into this that there wouldn't be hentai- I know what an M rating implies- and I think it was better off not being so. Excessive sexual content draws people in, but also keeps people at a distance.
All things considered, the game was fun, and the difficulties/outcomes add further entertainment. I'm not sure if it's what the game designer was going for, but the differences between difficulty were negligible. I had to be on my toes with each increase in difficulty, but not much more, and I felt I could've beaten an "extra hard" mode with relative ease.
All in all, I'd like to see a more polished version of this in the future. More options, greater difficulty, and greater rewards (whatever they are) for beating the game at said higher difficulty.