Kaiju Crush

Taking place in the fictional city of Megyo, you take the role of the player character, a dissatisfied salaryman whose world gets turned upside-down by an attack by Zira, the legendary monster who’s been devastating the city for the past 3 years. Now the same size as the giant monsters, your job is to convince Zira to stop attacking the city and have her help save the world from an impeding alien invasion as you get closer to one of four monster girls: Titania, your former best friend now a giant just like you, Koni, the queen of Crossbones Island and their patron goddess, Pegi, an alien robot who previously served the invasion about to attack the world and Zira herself.

[From Steam]