But man, Gal•Gun is suuuuuper problematic.
It's like an on-rails shooter like Virtua Cop or House of the Dead (insert whatever concern you have about violence here), except there's wave after wave of schoolgirls that are falling in love with "you."
In a society where men/boys lash out at women/girls when they don't receive the affection they feel they deserve, titles like this only make things worse.
There are so many other ways to spend their resources making games that are fun, that don't contribute to toxic gender stereotypes.
Celeste
Stardew Valley
Enter the Gungeon
Snipperclips
Oxenfree
Golf Story
I am Setsuna
The Flame in the Flood
Lovers in a Dangerous Spacetime