2 things I've noticed.
1. Megumin's tits are smaller in this game. Poor Megumin, not only is she getting younger with with each official adaptation, but now even the adult parodies are bullying her too.
2. Eris doesn't pad her chest. Though that could just have the one scene where she's caught. In following scenes the only padding is a bra.
Apart from those things. The game is great and really worth the 4 hours I spent wondering around blindly before realising there's a tab that tells you you've already seen all the events.