Here are some suggestions, from a guy that comes up with a lot of ideas:
- Make a femboy version. Either a different game, or just an alternate model. Might be able to work just by a flat chest option and being able to add a dick.
- Add different positions, like being fully spread eagled for example.
- Add clothing and accessory options like a maid dress, a skirt, clit and nipple piercings, and a rope bondage harness.
- Add some way to have multiple smaller tentacles per hole, and maybe add sounding.
- Add a modifier for tentacle size.