Finished it on Easy difficulty, but it feels like it's totally doable beating it on Normal if you want a challenge. The combat is alright, but it honestly felt like early-game was all about playing chicken with enemies and picking up trash. Once you unlock the "C" option for an H-move, you can just use that for the entire game.
The trick is in playing defensively: do enough damage to make sure the enemy's pink health doesn't regenerate, but not too greedy for their counter. Hold the key the game tells you to three times, and half the pink health bar will vanish. It's basically one big game of horny attrition.
The porn is alright, good even, but a lot of game over scenes don't have any real consequences, apart from H-stats. If you lose to a boss, Pako will either flee or the story will force you to win. It's also annoying there's no way to weaken yourself if you've hit the endgame, meaning early game enemies die almost instantly to a gentle touch.
If you wanna see the gallery, you're gonna have to play the game properly. And while some of the scenes are great, it's a slog at times. If you just want to clear ASAP, no mess or fuss, go to the Settings and select Easy.