So, it's definitely too early too tell with this game but I do have some critiques and corresponding suggestions.
1. Combat, Stealth, and movement feels jank.
-Suggestion: I'd recommend making block negate damage rather than what seems to be a partial damage system we have atm. Similarly, make stealth more... obvious. The danger meter doesn't help much, and it's hard to tell if I'm actually in cover. Additionally, ensure that, if a section is meant to be stealthed, provide clear path where enemies aren't facing to let us sneak past. Like a Shinobi, y'know? Alternatively, make them patrol.
Alotta this, I hope, can be patched up as time goes on but I feel these basic mechanics are in their pre-alpha state, still needing heavy refinement to find that "fun" loop of parrying/slashing/dodging/grappling/sneaking that Sekiro had in its gameplay loop.
The roughness of these aspects alone, at this point in time, are why i'm rating it so low. If these were better, it could probably go up a star or two. After all, this is an action game first and foremost, right?
I'd hope that the action part is going to get the bulk of the refinement, first and foremost.
2. Lewd Content feels awkward to play / Scene Viewer-esque but not in a good way.
Let's make it clear, Animations ARE good for an alpha build/vertical slice, but how the lewd content interacts with gameplay is strange and distracting.
In short, Ludonarrative Dissonance in maximum effect, and its arguably wasting the fun of the scenario as a game, especially a 3D iteration on the Kunoichi Hentai Game formula (ala Kunoichi Botan 1 & 2/Yagiri/Sekiren, Mommy Milkers Miko, Wolf in Shadow, etc.)
Suggestion: if sex is meant to be a weapon for our protagonist, have a grapple/battle fuck system if an enemy manages to use a heavy/grab attack on the heroine. Have the sex be a tactical game in and of itself to come out on top, and THEN have the finishing blow be the poison the ninja girl secretes. Additionally, to balance it out, have a risk of failure if she hasn't properly met the win-condition for a battle-fuck, where an enemy can shrug it off and dominate her.
The poison has to be an active mechanic, and an active choice she makes at the right time to finish off an enemy.
In this way, it can still be relevant lore wise but show a semblence of balance, and make sex feel risky for her, especially when there's multiple assailants, or when she's lost the upper hand and is being pounded silly.
Additionally, you could add a punishment for getting creampie'd too much, making the poison effect harder to do or have less impact, meaning she has to do double dosage as the arousal she feels and cum inside her throws the poison's potency out of whack or something.
(additionally would help differentiate enemies and their possibly effects/powers in sex andnormal combat. Like, bigger and heavier enemies can cum gallons in one go, while beast enemies like kappa or attack dogs can keep going right away after cumming, and have a higher poison resistance than grunts, but less than heavier enemies like Onis/Ogres, boss soldiers/commanders, and giant monsters. And for certain soldiers, can have some attempt to use aphrodisiacs or their own secretions similar to our heroine in an attempt to "win" the battle-fuck (or even have some enemies try to stealth attack HER instead of hte other way around,basically trying to pounce on her while in a certain area. Could especially be good for Kappa enemies, for example, so her poison feels liek an important defense mechanism against dangerous foes that can fuck her into submission with ease without it.
For reference as to what I mean, look at Kunoichi Botan (1 & 2's) battlefuck system, AND look at Kunoichi Sekiren.
For Botan, enemies that manage to grab the protagonist can be seduced into letting their guard down, opening them for an insta-kill. However, if the protagonist fails, they open themselves up to taking heavy damage from rough sex.
For Sekiren,the ninja girl uses sexual attacks as finishers and traps more frequently, and is able to display her superhuman agility and strength when she does. HOWEVER she isn't invulnerable to being dominated, especially when an enemy (like the bandit boss) can grab her and pin her, leading to a battle-fuck/struggle-session where she must break free before she's fucked into submission, rather than the other way around.
A way this game can easily stand out between other Kunoichi games like Botan or Sekiren is to incorporate a gangbang system that can make escaping or controlling an enemy via their lust harder, similar to Wolf of Shadow. Especially if our protagonist's greatest strength is sex, it should be a double-edged sword where, so long as she's in control, she can come out on top. But if she isn't, and a powerful (or multiple) enemies converge on her, she's as helpless as any other ninja girl, no matter the poisons she uses.
For THIS game, I feel stealth and tactical play should be the goal, and having sex be better incorporated into that would help this game stand out from other Unreal/Unity asset-flips where they half-heartedly copy Dark Souls just for you to get diddled by a goblin rather than any meaningful struggle/battle-fuck system.
As a lesser note/side note: cosmetics.
Would like it if the girl had more variety in gear/clothing, or at least walked/ran differently whether she was in heels or not.
A little complaint, and imo the least important compared to the prior 2 critiques I have mentioned above.