Yes, you can! When a project is in Flow, you can override the status of it by clicking on the drop-down located above the asset. You can indicate whether it needs changes, is in editing, it's approved or simply ready to publish right away without having go through all the stages manually.

When an asset is in the Editing stage and you want to share it for review again, there is also an action called "Undo state" which will send it back to the Review stage - and then you can easily share it to your reviewers again.