Thermostat Controller - No longer in Alexa App Store?

I loved this app to control my Nest from Amazon Echo. Today, I discovered that the commands do not work. For example: “Alexa, tell the thermostat that I am leaving” will confirm with “goodbye!” but it no longer sets my Nest to Away mode. Also, this app no longer shows up in my Smart Home section of Echo, but it can be seen here on Amazon:

Anyone else using this app who is having similar experience with it?