Be patient, he said it's coming soon! I used this on my Nexus 6P before it was replaced by Google with a Pixel XL, and I agree it works great, for slow motion I always use the stock app anyway so it's not a big issue to me. This app is very well done and stable, so even with the current version I'm happy with it (although RAW capture would be great).
So I tried this out for the first time recently on my 6P, and there was one issue that kept me from leaving my stock Google Camera app for this one. In the stock app when I take an HDR picture, I can see the picture as it's being processed. In this app I only see black until the processing is complete. When taking multiple pictures the problem is exacerbated, naturally, as I find myself staring at numerous black screens for quite a while as they each process.
Is this the behavior of the app on Pixel devices, or is it just how the modded APK performs on non-Pixel devices like the 6P?