Returnal has been updated to version 2.0 today by Housemarque. You can find out the complete patch notes for this update from here.
According to Housemarque, the much-requested suspend cycle has finally been added to the game however it doesn’t appear to actually save the game, rather suspends it. Once you load the game again, your save point will be overwritten so technically you can’t go back and retry from a checkpoint. Get the details on the update below, or find them on the official website.