The final game won't exactly have a seduction system, but more of an option to appease enemies. I'm not sure if that will make it into the upcoming demo build though.
As for death in this build on Itch currently dying either gives you an abrupt game over or you respawn at the cabin. The next build will be quite different. Though in general the game features very limited sexual content as a result of losing battles.
And lastly a gallery has been implemented into the current build that I have but is not active in any demo currently. The basic system is in place, so I just need to set it up for all the scenes to be unlocked properly. The final demo (which should be out in a few months) will include this system and it's save file will be compatible with the full game. September is planned to release a playable teaser focused on the updated combat mechanics.
It will have a different meaning for various enemies. The reworked Act command will essentially give the player ways to end battles in a non violent manner. In the current build for example you can pet cute slime enemies to end a battle, or throw a stick at dogs. But I'll be expanding this system to the various enemy types each with their own unique ways to avoid combat, including some lewd options.