How do I make my game retro styled?

I didn't select a retro styled template for this project. I want to make my game cleanly pixellated (including rotating objects).

I enabled pixel rounding with an event, and it rounds the objects' positions but it doesn't pixellate anything. The pixellate effect does not work for rotating objects.

Is there an option to do this?

(this is the result I want - done in a retro styled template)

And you can't use the retro styled template because...?

I want some objects to be smooth, while others will be pixellated (for things like camera movement)