Love the vibe and the art style of the game! The mechanics also look very promising, keep at it!
Some suggestions on top of what was mentioned below. I tried to find less obvious ones which are also relatively easy to implement:
1. H-scenes are very sudden, I think a massive improvements would be to make them more gradually increasing in intensity - even gooners appreciate some foreplay. It doesn't even have to be detailed art, some text that smoothes the transition between clicking a button "focus on mage" and c*ming down the throat.
2. Battles are very random atm. You can do some strategy, but not much of it. Some very simple ones that can help:
2.1 All enemies are attacking at random (as far as I can tell). Taunt-like skill on a tank would add to ability of the player to control things
2.2 Its impossible to tell (or I could figure out how) which enemies are next in order if there are multiple enemies of the same type (which seems to be the norm). This makes focus fire and usages of stun difficult to pull of. A simple highlight of the enemy in the turn queue would remove the frustration