Re: 変身勇者リオナ/Makeover Brave Riona
Just played through the demo:
From what I've seen it's a "go through this storyline and sex scenes will happen to you" kind of game. Obviously there is a plot but I don't Japanese, so...
Gameplay: There's an interesting mechanic that they added in that lets you switch between (certain?) outfits on-the-fly, which changes your skillset. The game also hugely favors exploiting weaknesses, which is nice; don't see weaknesses playing a huge factor in a lot of RPGmaker games.
Mechanics:
Has an erometer and a sex-counter. (Functionality still a mystery)
Also a throttle key that works pretty selectively.
No reward/punishment mechanic for losing to mobs in the demo, except scripted events.
Hentai: Hard to tell. Every scene in the demo ends in an ahegao. A lot of tentacles in the demo but that's about it.
Overall, I'd say...
It's not going to blow your mind, but it's good for what it does.