A few things I think are cool:
4MB Docker Image Size
Instant Startup
AWS Sigv4 Authentication
A little admin UI that can be helpful for development/troubleshooting
Most of the SQS API implemented, the rest will soon follow :)
Is this to make sure services are wired up with permission and communicate properly before you deploy or what is the use case ?
Also, why not have a dev environment where you can test things on the real thing (ideally with smaller size instances to save $)