I have played RJ01397563. I expected it to be bad and that's exactly what I got.
The gameplay consists of 3 different qtes and nothing else. You attack by pressing attack when the bar moving back and forth aligns with the hit marker. You block by pressing block when the enemy's atb fills up and they flash red right before attacking. Some attacks, instead of doing direct damage when they hit you, cause a grapple and require you to mash left/right to escape while doing constant damage. There's 5 fights in the game and if you never lost it would probably only take about 5 minutes to play. The timing for the qtes is tight enough that I would expect it to take maybe 10-15 minutes to casually play through if you tried to win the whole time. The controls feel a bit unresponsive at times, though it's unclear if it's an intentional cooldown that prevents attacking right after escaping a grapple or blocking an attack.
The h is okayish. Each boss has 3 or 4 attacks each, all with cut in CGs. Of those attacks each boss has 1 or 2 grapple attacks. There's also a game over CG for each boss and a number of different variations of the protagonist lying on the ground after being defeated. Most attacks are ryona focused and not sexual, though a couple of the grapples are molestation.
Overall I give the game a 1/5 there's just not much game here, and what little there is is pretty mediocre. I still liked it.