Hi Nahiro! First of all, thank you again so much for the support, you've made my day again haha! 😄❤️
In the current Gen5 Render Pipeline, dynamic (realtime) shadow casting isn’t supported. That’s an intentional limitation to keep the pipeline lightweight and consistent with the retro rendering style. Shadows are available via baking only. Objects need to be static and you need to enable Baked Lighting Enabled in the default pipeline material (G5Lit)
If you want realtime shadows (dynamic) in the future, I can look into adding that for sure!
Hope that helps!