I have played RJ01265896. Game sucks.
The gameplay is bad. It's a simple side scroller where you can only move left and right and sprint. You mostly just have to walk forward and occasionally wait a second for enemies to move out of the way. There's a tutorial that implies you can spawn in invincibility boxes but after the tutorial it never seems to be required. Actually going and checking it now it seems like there's a couple options including a move speed up gift as well which might have been nice, but also there's a unique enemy spawn that costs a lot so you probably don't want to spend anything anyways to save up for it.
The h is decent. You have a couple of animated cg story scenes and then regular grabs and GoR with the regular chibi model. The cg scenes are all tentacle rape while the chibi ones are a mix of rape and ryona. The chibi scenes are more tentacle than not as well. I really expected some guro (some of the ryona stuff is lethal so maybe that counts?) but other than one ending there's not even blood in any of the scenes. But worst of all the game has no gallery unlock and no stage select. Scenes are in a completely random order in the gallery so you can't even use that to find which ones you missed. Some enemies have more than one animation that they pick at random and other times it's based on the room the enemy is in, so it's overall a hassle to fully unlock the gallery.
Overall I give it a 2/5, just because chibi sexo. I can't believe the dev fucked up a chibi game this bad chibi fans don't deserve this. luckily for me this is one of the few times I pirated a game instead of purchasing it, otherwise I would have absolutely regretted it.