Compare with melpa-check
@akirak has recently published https://github.com/akirak/melpa-check, which is a similar tool that looks very powerful.
Thank you for the attention. It's becoming a controversial project (see the thread on the MELPA PR). Depending on responses of people on MELPA, I may change its name in the future. One of the major contributors of lsp-mode tried it out, but I've encountered a technical problem with Nix. It's in an unstable state now.
Thanks for the update. Hope it goes well! :)
I've closed the PR and will probably change the name. I have a lot to learn about Nix, so you may not have to write the comparison now :) Its design is subject to change.