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I'd say no need for a demo as it can ruin the game if its too much, and a demo without meat is largely a waste of time to play. Though I'd be interested in seeing an example of one of the H-scenes to experience the art, sound effects, writing style, and if there is animation or not. Though it would be ideal if it was one of the throwaway scenes so just a minor monster scenes. 

Though I'm interested in the game concept since you are going with avoidable NTR in an RPG. Especially as it seems NTR will occur if the player messes up, rather than the traditional player makes an purposeful decision to flag NTR. Though I have to ask will this game have a main pole or is this strictly group NTR? Also will the heroine merely sleep with a plethora of men in one off events or will there be an NTR story arc where she is seduced by a main pole or others? 

NTR is all about the tension and for that reason this was sadly sorely lacking primarily due to its length. As such since you plan to make another project I suggest you stretch out the fall. This is easily done by not jumping straight to sex, but starting out with bjs, fingering, rubbing, and so on and then progressing to condomed sex and so on. This is best done by offering scenes from the heroines prospective as well, but that isn't needed. Another way to add tension is to make the reason for the fall be because of the MC. Here, it is suggested that the heroine accepted the advances because she feels neglected which is very good. Such themes are powerful if well done, and build to believability so I suggest you continue on with that path. Lastly, acquiring sound effects for sex is a major way to improve your game. Sex sound effects like moan loops, humping noises, and bed creaks adds to the erotic tone. 

Overall, the lack of sex sounds killed this game for me and the lack of build up and length also hurt it. I look forward to seeing the next project and hope you build upon this work. Lastly, don't feel required to bring in side men for the NTR as any good NTR is emotional as well as physical. So gangbangs and side action by other character like the boss take away from the fact that the heroine is being stolen from the MC. If the heroine is a slut who has sex with anyone then she isn't stolen but rather never was the MC's women nor the main NTR guys.