I have an embarrassing amount of time sunk into NSFW games, I hope this info can be of some use even though a lot of it will be personal preference as many things are.
The gameplay in the game right now is not bad, I feel the important part is it's not tedious (like many games where you grind the same thing over and over are) and doesn't take too long. Also preferably able to do one handed for obvious reasons.
Basically it shouldn't take you out of the flow of the steamy action. If you spend 20 minutes between scenes doing wario ware minigames with both hands and if you fail you either get stuck repeating it or a game over people will be taken out of the mood.
However I think what you have right now is good, with the small minigames that help flesh out the story and are just actions the character does add a bit of charm to it and help it stand out from your standard VN style games.
So in my personal opinion, I say keep going for the gamejam style minigames but always keep in mind that they shouldn't be too long or complicated else players will start asking for ways to skip or cheat them just so they can get the scenes they want to see. For players the scenes and story will most of the time always be the important part of NSFW games, and the gameplay is there to embelish that.
Lastly what I think in my personal opinion is important: NEVER tie a scene directly to a minigame that needs your focus, it's an absolute shame to have a great scene in a game but not being able to fully appreciate it because you are busy juggling or something.
