Why is Google not indexing this Angular site correctly?

Question

Google

There is a site https://kisskiss.show
If you look at what is in the Google index, that is, type in the search:
site:kisskiss.show
You can see ~ 20 pages. But if you look at what's in the cache, not a single page is correctly saved there. But at the same time, when viewed as a Google Bot, everything is displayed correctly. Where to dig?

Answer 1

Because the site was made without server side rendering support, for good indexing it had to be done with Angular Universal.
Implementation of server-side page generation for app...

Answer 2

pretender.io or as advised by SSR
ZY prerender is free.