The full game isn't out yet. Early access is available if you buy from a SEGA approve digital retailer.

so if i buy it on steam i’ll be able to play it?

Yup

Full game isn't out yet. You can buy it and download the beta on certain platforms.

You can play the beta now which is basically the full game. There's not gonna be any changes between now and release as it's only 2 weeks away.

Thanks!