How to pay £20 more to play, having preordered just 'basic'?

I only preordered the basic game but the pre-alpha looks like great fun to play.

Is there a way belatedly to pay an extra £20 for the luxury edition instead?

If you bought it in the xsolla-store (and not Fig-backer/crowdox), then email support ( ) and @UnstableVoltage should be able to help.

Thanks. I bought it at and have written to