Great idea, poor execution.
I think the app serves a great purpose for when you can't connect to internet. Been there done that.
My thoughts, I poked around on the app and when I tapped the button to start the process to order an Uber, there was no way to get back or cancel the drive. The only options were to message or call the driver.
I have an iPhone and was using a friends Android.
When I tried to message or call the driver to cancel the order, it would not connect me because my account did not match my friend phone number. This might be due to the Uber API but a cancel button is necessary.
Again, it's a great idea and would love to try this app after it's more polished. I would recommend setting up a way for users to test the app and give feedback before publishing.
Best wishes and good luck!