Quick Review of the Demo (I'll give an official rating when I get through the full game):
Very enjoyable game, there's a good 12+ hours available on the 0.3.5 version that's given away for free. The girls are fairly pretty, particularly for anime art style, and the story is pretty good if you like My Hero Academia. I've certainly gotten invested in it and I'm looking forward to seeing how it all plays out.
The RPG mechanics are very unpolished, but still enjoyable. This is the kind of thing that I would normally find annoying in an AVN, but it's implemented well enough that I got invested in it. There is definitely not enough leeway given for ensuring you figure out what works and what doesn't as the game rushes you through events. It's very easy at first but then there is a huge jump in difficulty about 6-8 hours into the game, and if you've just not built the right stats you're going to start having a very difficult time. Consequently, I might find I need to restart after I get further into the real game. I'm not sure how screwed I am yet.
I can definitely say focus more on leveling attack first, as there is no healing, so each fight is a DPS race and your damage is abysmal to begin with. This one thing I did right. Meanwhile, health, defense, and evasion are good enough to get you through early. At some point you need to shift to boosting defense and/or evasion though, I think, and I'm not sure exactly where that should be.
I leveled up my super strength to 3 and I feel like that was a mistake - I'm not really seeing a big benefit going from 2 to 3 and once the difficulty spiked, I can't help but wonder if getting the ability to fly would have served me better. Don't know yet.
Anyway, the game is well worth trying out for free, and then you can decide whether or not you want to buy it. I enjoyed it enough that I decided to purchase it, particularly at a $10 price point. Based on what I've seen so far, I believe I will be extremely satisfied with the value at that price point.