You can delete your Omega account in the app:
Profile → Settings → About Omega → Delete account. Type DELETE in capitals to confirm.
You can sign back in within about 30 days to cancel the deletion. After that the account is permanently removed.
Web delete is not available yet.
Deleting the app or the Omega account does not cancel a store subscription. Cancel that in Google Play or the App Store.
Reply with your user ID so an agent can look this up.