Artstyle by Bakemonogatari Artist?

[The Drink]

I find a lot of the characters have similar design to characters like Hachikuji and Senjogahara.

[Chizu?]

Yes, I believe this game has a couple different character artists.
The artist you are looking for is Watanabe Akio (also known as Poyoyon Rock).

He did character designs for Grisaia, the Monogatari series and a number of other anime and games.

[Richardowl]

Hi, excuse me, I see this game has a very distinctive style and is similar to the one I'm looking for. It's a 2007 visual novel called Chu x Chu Idol, from Unison Shift: Accent. Do you know if this game is related in any way? It actually feels somewhat similar.