They're more like the boss gargoyle. All of them are grab attacks, some of them involve Youki immediately being swallowed and having to escape from the stomach before her HP is 0, while others only swallow Youki when her HP is 0. So far, the animations that have been publicly shown (key word here)...
-Mandragora: Immediately swallows Youki. HP damage is done while inside of the stomach. If Youki doesn't escape, she is digested, her panties are spit out, and she loses a life.
-Zombie: Grabs Youki and puts her in her mouth. If Youki doesn't escape before her HP is 0, she is swallowed, and she loses a life.
-Goblin: Grabs Youki and starts masturbating, rapidly filling the H gauge. When the H gauge is fully blue, the goblin starts using Youki as a toy. Once Youki's HP or H gauge fills, Youki is shoved all the way inside, the goblin tightens her panties back up, touches herself one more time, then gets up. Youki loses a life after this.
The harpy should be shown soon...I made a request about altering the animation a bit, but I decided it was already extremely good (absolutely my favorite so far) and asked Nana to disregard it. I don't think it would be an improvement after all. I'm not sure I was able to convey this properly to Nana though...there was something else, but I won't mention it. Nana should be the one to reveal it. I think the lizard girl will be the next one in development.