Navigate your phone settings and first go to about phone. From there go to software information. You should see your build number. Tap the build number several times in a row and developer options will be unlocked. This gives you access to developer options and a whole new set of customization features
I played Limbus Company entirely via scrcpy (the steam version was giving me issues), and the experience was perfect. No quality issues, no noticeable lag or delay, I frequently forgot it wasn’t running natively.