Crash confirmed, it's an out of memory error.
Apparently the 95Mb MP3 file (background sound, 1 hour) is too much for the app to handle. This is because the MP3 file has to be loaded into memory completely before playing (it's not streaming audio). In memory the MP3 file is uncompressed and the size is a lot bigger than 95Mb. If you can replace this file with an MP3 file of a few Mb (few minutes) the tour shouldn't crash anymore.
This beta version (1.1.269) supports custom hotspot images, but the images that you are using (arrows) have a resolution of approximately 6300x3400 pixels. When loading three of these the memory of the Oculus fills up really quick and they take a long time to load. I've reduced them to a texture of 512 pixels high or wide (large enough for the displayed size) and they load quickly now. I'll send you the resized arrows so you can replace them.