While im into transformations content, So im interested what the idea is?...But for those images, You'd be leaving kemonomimi and going into furry. For me that is a big difference. In my opinion, if you do go that way, They be best used as a monster/feral type. Then up to the player if he wants to fuck them or not.
If the girls had multiboob as beastgirls, that be hot
Also, having finished the content, I see where its going now with the play as the monster, makse a bit more sense why the MC has goblin images. But if you plan for more monster types, then it sounds interesting.
Just two other notes while playing
1, Override commands are for patroens ?
2 Replay should be for watching the scene again ?