I was a bit disappointed by the suggested builds, because they're small, but I also understand it's early on and a difficult thing to do.
Not vital, but I was surprised that it doesn't look for colors at all.
One thing I'd love is the same technology, but used to look for a particular part. It does that once you pick a build, but imagine building your own thing rather than suggestions and having the app tell you where you can find the piece you're looking for. If you're adventurous, you would even have a custom tray with a spotlight directed at your pile :)
I've been trying to take thousands of mixed parts back into their original sets and I was hoping this might be helpful. The technology itself probably would, but not packaged as it is for the moment.
All that being said: really well done!