At the moment, you won't be able to export a project file and send it to another device.
However, you can access your projects on a different device by performing a device backup to iCloud, and then restore that backup to your other device. In order to restore from an iCloud backup you'll need to erase all content on your device then choose a backup to restore from.
To make sure your projects are saved in the backup, make sure you have enabled Launchpad, Groovebox and Blocs Wave in iCloud settings.
Then please see this Apple Support article which will guide you through backing up your device to iCloud.
Please note, we cannot guarantee third party backup apps will successfully restore your projects to a new device.