Thank you. I have checked your keyboard shortcuts charts, nice colors and very interesting. Your app that makes me think about another nice app Darktable available for ubuntu but yours seems more a 16 bit alchemy enhancer rather than a raw developer.
If Apple supports small teams dev with a smart intuitive experience for end-users in mind, Apple //'s spirit will come back. A pleasant app is ever great for a correct creation.
All the best.
I'm sure you'll get the hang of Affinity Photo in no time :) We have many video tutorials available explaining what's available within app. We also have a keyboard shortcut cheat sheet available to help users get up to speed. The app supports both color management and quality image manipulation, we also have many more features to come in the future ( check out our roadmap here). I can only suggest that you use the app to do real work and see if it works for you - if you feel that something is missing or needs improving, let us know.
I'm sure other users will share their experiences with the app.