Well, I took my time messing with this one... and I have to say I have mixed feelings about it (even beyond the usual ones I have when MTL of any kind is involved...)
This is by far Acerola's weakest release in QUITE a while. Not just in terms of gameplay, but also of content in general. The game is a pure scene collector and the stats are mostly for show and much more poorly implemented than they've ever been. (Excitement, for example, seems to do exactly nothing...) They re-use CGs quite a bit... though even then, they still have a lot more variety then plenty of other games out there... but it's a poor showing by Acerola standards.
Also annoying is the gallery. Each of the four guys that can pursue Chika have some dot animations that are specific to them that do NOT show up in the gallery. You can only see them in the game as you play. Additionally, the gallery doesn't include stuff like the calls you can make to Chika while she's fucking around or anything of that sort.
The only thing that still seems to be on point for Acerola is the writing... as much as one can tell with the MTL, but it seems to have their usual lewd and humorous tone that's characteristic in all of their works. Chika is established from the intro to be an absolutely massive nympho, albeit unaware of the full severity of her own tendencies, and her "fall" to each of the guys that can pursue her is well in character with what's established, if ridiculous and exaggerated in various ways. Still, it works, and the resulting scenes are hot if you like Acerola's usual style and shenanigans. Chika is hot and lewd, and becomes increasingly lewd as things move forward.
Additionally, it's actually pretty typical for the heroines in their NTR works to fall in a matter of days. The number of specific events "per route" is actually still normal for Acerola, there's just a lot fewer options overall. Especially when you compare it with its predecessor, the Monica game.
That's not a fair comparison btw, because that game got content in both patches and the Append, and had a much longer development time than the Chika game, AND it didn't have as much of a competition for resources.
When judging this game, several things must be noted:
1. It was done partly in time with the previous tentacle game as well as Dragon Blood, which is Acerola's current major project that's been in the works for quite a while. This was never meant to be a true successor to Monica.
2. This is the 1st time that Acerola made a game that's played from the cuck's perspective in full, and it was mostly done due to fan request from my understanding of things. The circle has no real experience with that, and from what I've seen, they don't particularly care about what makes it appealing in the harder NTR circles either, so it was bound to be a flop from those angles.
3. This is the 1st time Acerola introduced full on, absolutely completely functional Mouse support in a Wolf Game. Wolf, as an engine, was infamously bad about mouse support, though I dunno if that applies to the newer versions of the engine. Chika was made with a newer wolf version than most Acerola games (though some were updated to said version). Because of that, there was likely some teething involved on top of reduced resources for the project.
4. Well, no matter how you look at it, this game is still head and shoulders above many other H-games out there in terms of content and quality, as long as you enjoy Acerola's specific art style and writing.
All in all, NTR Sister Chika is a bad Acerola game for sure, but it's still a pretty decent H-game in general. Where I'd say that most of Acerola's games are 4 star material or 4.5 stars, as long as you enjoy the subjective elements involved... then this one is more along the lines of a 3-star, if you squint. Probably a 2.5 star. At least on pure objective elements. If you like big tiddy, twin-tailed slutty blondes that get addicted to cocks easily, than this game is definitely worth grabbing and enjoying.
Don't come here for the NTR though. It's very "soft" and very poorly implemented for the cuck perspective. Even the corruption angle basically doesn't exist. This is more a game about Chika getting all the dicks to satisfy her nymphomania than it is a game about Kazuki getting cucked.