You should be able to run it but with frame drops. I can't give precise numbers but with my laptops HD 3000 chip just scraping 30 I imagine the HD 630 will get you a stable 30fps.

There's a demo in development but it's unfortunately nowhere near ready at the moment since it needs to be updated with many under the hood changes the latest releases currently have. Steam has a refund policy so if you created an account and bought the game to find out it's not playable, you can refund it as long as your tracked playtime is under 2 hours and is refunded within 14 days.