To troubleshoot the issue of no sound in the game "Love and Deepspace" on your iPhone, follow these steps:

1. Check Silent Mode: Ensure that your iPhone is not in silent mode. You can do this by checking the switch on the side of your device and confirming it's not showing orange. If it is, switch it back to enable sound.

2. Adjust Volume: Increase the volume using the volume buttons on the side of your iPhone while the game is open. Sometimes, the game may have its own volume settings that differ from the main iPhone volume.

3. Close Other Apps: Close any other apps running in the background. Sometimes, apps like music players can interfere with game sounds.

4. Restart the Game: Fully close the "Love and Deepspace" game and reopen it. This can resolve minor glitches affecting sound.

5. Update the Game: Check the App Store for any available updates for "Love and Deepspace." An outdated version may have bugs affecting sound.

6. Reinstall the Game: If the sound issue persists, uninstall the game and then reinstall it. This can resolve corruption issues that might be affecting sound.

7. Check Headphones: If you're using headphones, make sure they are properly connected. Disconnect them and test the game’s sound through the device’s speakers.

8. System Sound Settings: Go to Settings > Sounds & Haptics and ensure that all relevant sound options are set correctly, including Ringer and Alerts.

9. Reset All Settings: If you still have issues, consider resetting all settings. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings. Note that this won't erase your data but will reset system settings.

10. Consult Official Support: As a last resort, visit the Apple Support Community for assistance or report the issue on the game’s support forum if it's specific to "Love and Deepspace" - learn more - learn more - learn more.

By following these steps, you should be able to resolve the no sound issue in "Love and Deepspace."