Yup. It's Tegra only for now. They're promising Galaxy S3 support at some point in the future so I changed my build.prop to look like a Nexus 7 and bought it for .25 but it definitely will not run on any non-Tegra devices at all.
If anyone is looking to get a non-compatible app without...
I think I'm going to change the build.prop on my Touchpad and buy Horn in the hopes that it will be compatible with either the Touchpad or my S3 someday.
Edit: changed my Touchpad's build.prop to look like a Nexus 7 and I'm downloading this now.