16bit Sensation: Another Layer

Konoha is a passionate bishōjo game fan who dreams of creating her own characters and games, but she's stuck in a menial job where her talents are wasted. This all changes when she's flung back in time to 1992, when bishōjo games as we know them were just starting out. Landing a job at upstart game company Alcohol Soft, Konoha has the chance to live her dream. There's just one problem: if she creates a hit game in the past, she might irrevocably change the present.

Synopsis from Anime News Network