Rx has a bit of a "namespace collision" with the functional reactive programming library ReactiveX, which has implementations in many different languages. Often these libraries are called Rx(Java|Swift|Ruby|PHP|js|$LANG).
people bring this kind of thing up in every thread as if it's a useful comment for either the reader or the poster (presumably project author). it's almost as common as "this page sucks on mobile".
who cares? we all know how to use Google by now to narrow results by adding qualifying keywords to the query; it's not like I'm just going to search "rx" or even "rx rust" when I'm looking for this project (probably "rx rust pixel"). it's a complete non-issue.
Let's keep in mind that this is an end user application for pixel artwork. You and I might care that it's Rust. End Users will not. It could be written in Malbolge or BF for all an end user cares about.
Namespace collision is gonna be a pain for end users and newcomers, possibly depressing discovery, which is our point.
Why would you image an author would not care that their page "suck on mobile". If they are posting/sharing their stuff, they more than likely want people to consume (and spread/reshare it). Both being poor experience on mobile and non-discoverably, hard to search for impact that.
I can easily imagine an author who rarely uses their own mobile page except to make sure that it works at all; or who knows it's not great, but doesn't realize just how annoying it is; or even who has never looked at their site on mobile, ever.
Paradigm: http://reactivex.io/ Implementations: http://reactivex.io/languages.html
That being said the editor looks very cool! Congrats on shipping!