It's a new app and quite quirky but no doubt will get updated and improved over time. The version I tried only produces square images (I doubt it's because the makers are fans of Rollei or Hasselblad) so it is not possible to preserve the original images aspect ratio. In a similar way, the app forces portrait viewing which is a bit annoying when using a tablet and a keyboard.
However, once you have taken a photo or selected one from your device you can have some fun. There are over a dozen different presets which you can select and see which one takes your fancy. Some of the names and thumbnail pictures are a bit more intricate than the actual result you can expect but the results also vary largely depending on the image that you use. For instance, there is not much point in going for the Heisenberg filter with a very dark image as most of the detail will be lost.
The odd thing about the app is that all of the processing is done online. Seeing as the app is trendy right now, the servers get overloaded and you either have to wait a while for the image to get processed or it down right won't work at all. This is probably fine if on a home network but you may want to consider uploading large images over your mobile as it isn't clear how much data is being used each time you try and fail to get a result.