Indiegala can you add money to bundle

Buy it again. Donate $4 to charity and get more games to giveaway. ¯\_(ツ)_/¯
Seriously though, I don't know. I don't think you can.

Check if there is add amount to bundle option. if so it should work.

Hmmm, I'd suggest sending an email to support@indiegala.com explaining the situation, since every time I've made a mistake buying an Indie Gala bundle (i.e. forgetting to select buy as a gift for happy hour) their support were able to help.

Due to time zone differences (I believe they are located in Rome) there were times I had to wait a day for a reply, but it was just bundle games so I wasn't exactly in a hurry... Good luck! :)