Neat tool!
Not sure I agree with the choices on the AWS side, particularly lambda and dynamo. They seem great when you first start, but I've found the pain comes with maturing code.
As professionals, we should always plan for our code to live longer than we thought originally, and supporting new use cases not in the initial design.
A cheap always on server and a hosted RDBMS are going to go a lot further for next to the same mental overhead.