Warlock and Boobs doesn't want to be a game about being sex god -- the intro to the game specifically says it's not a harem game, even though there's at least a dozen women you can have sex with. Instead, you're the local wizard-in-training in a small village that really, really likes sex.
It's aiming for giving the player the specific experience of being a normal-ish guy who has a lot of sex because everyone is a having a lot of sex that is behind the big complaint people have about this game: the grind. In the case of relationship-point locked scenes, I definitely think it's a problem. There are a fair number of scenes with relationship requirements so high that you wouldn't know they existed without a guide. The game desperately needs a hint system for scenes you haven't experienced yet.
When it comes to combat, it's not so much the grind as the random elements of combat. Even the basic fire and ice spells have a 10% failure rate that is going to screw you over surprisingly often. You can tell that the game doesn't want combat to be trivial (which is why fights don't give experience, so you specifically can't grind your way out of needing to worry about them), but the result is you're constantly tempted to save-scum combat instead of waste more time getting back to a hard fight.
So given this pretty glaring flaw, why is this still a four-star game? For as frustrating as the way the game limits you can be, the game really succeeds at nailing the local-guy-has-sexy-adventures vibe it's going for. I've played through this game twice now: the first time I cheated like hell, and the second time I didn't cheat at all, and I enjoyed the second time a lot more. There's something to building up a routine of getting your dick sucked by the neighbor girl in the morning, then going off to fight some big-titty fairies so you'll be horny enough to both fuck the local nun in the ass and titfuck the mayor's daughter that evening. It's a game with incredible art and a lot of sex (once you know where to find it), which puts it above a lot of other H-game RPGs.
It's worth noting that the game's approach to sex isn't going to be for everyone. Warlock and Boobs takes a more is more approach to sexiness, and that goes way beyond the massive busts on nearly every woman in the game. That gay filter is there for a reason: if you don't use it, you're gonna get fucked in the ass way more than you'd think for a game with as many big-titted women as it has on its cover banner. (Related to the game's penchant for pushing into weirder sex, the game is weirdly averse to vaginal sex. There's a ton of anal scenes, but only a handful of vaginal ones. Even the neighbor girl's one vaginal scene is locked behind a high RP requirement and a random chance to trigger.)
In conclusion: Warlock and Boobs is great at delivering a sexy adventure for the MC, but has some glaring gameplay flaws that will bounce a lot of people off the experience. I really recommend giving the game without cheats a shot, but if you really can't stand it: there's an in-game cheat room, which is pretty easy to find if you search the thread for this game.