I've published Auto Respond 1.0.1 to the Play Store.
The only difference is that it now handles responses over 160 characters, and it has a character counter under the text input on the main window to show you how many characters you have left. If you go over 160, it will display something like "142/2" showing that you are on your 2nd set of 160 characters, and that you have 142 characters left before going over another 160.
For most modern phones these messages will be received as 1 piece. But for users with older phones, or non-smart phones, they will be received as multiple messages, each containing 160 characters or less.
As usual, this update has been published, but may not be live on Google's severs for a an hour or more.
If anyone runs into another issue such as this, please let me know so that I can correct it.