This looks like an interesting project, but what makes it different from the CloudFormer tool already provided by CloudFormation?

On a slight aside, among the many features I wish CloudFormation supported, one of the biggest is the ability to create a new stack and fold existing resources into it, including highlighting but allowing any discrepencies. If you didn't develop with CloudFormation from the beginning (or perhaps are migrating from Terraform) then having to move your environment "sideways" into a new stack can be pretty painful.