I'm somewhat confused. I play honkai impact 3, and that game is 10GB on my phone
Viewing post in Harem Hotel v0.12 Patch Notes comments
The whole difference is in the principle of the engines installed by APK:
“Harem Hotel” - Renpy - 1 file (>~ 1.90 GB) - offline installer;
“Honkai Impact 3” - Unity - 2 main installer files (.obb and .data) - online installer.
Different engines and different assembly principles, so it’s not correct to compare them.