Hello,
You can create a rule:
Start date: the start date it is valid
End date: the end date it is valid
Rule type: order
Type: per order
Percent of Order Total: 200%
Credit Type: points
Not this will give decimal points also. So for example, if the order total is 12.25, the point total awarded will be 24.50.
You would probably need to manually run cron once you have published the rule to trigger the credits. You can find the cron url in admin > aworewards > configuration > cron tab.