Hi Kat,
We're hoping to release the Google Play store along with all the great Google Apps in the coming months as a software update for Vox. In the meantime, I don't recommend you root your Vox since the results can be unpredictable.
If you're having problems finding titles in the Kobo book store, feel free to e-mail
help@kobo.com requesting the titles and we can let you know when they might be available.
Best,
Jason