I really like the idea of Deno and Fresh's philosophy also resonates with me (I'm a Rails guy). I would like to see an integrated ORM (can be an existing one) and testing framework though, before I would consider it a "full-stack" web framework.
Not sure about ORM, but Postgres.js[0] works on Deno. For testing, Deno includes a built-in test runner and assertions via the std[1].