Hi Coffee,
We currently don't have a Google Wallet account, it is something we hope to eventually offer.
We do offer a few alternatives:
- Moneybookers
- Cheque
- Direct bank transfer
If you would like to use one of these options, drop me an email to supportxgh@scirra.com
Alternatively, we've just launched on Steam:
http://store.steampowered.com/app/227240/?snr=1_5_9__205
Steam offers a variety of payment options.