If by "in wordpad" you mean "as a plain ASCII text file that users can copy/paste or edit, regardless of their operating system", this is a step in the right direction. However, it is still not a great solution to providing the code in a usable, reproducible form. I think you should read the journal's own guidelines on this and if necessary, get advice from a local computer scientist.

I still not understand how your code targets individuals "who do not have an extensive computing experience." It requires that they are able to obtain R, type/edit the code and run it. So do the numerous existing methods for generating heat maps in R - many of which are no more complicated than this code and some of which are less so. The number, names or complexity of arguments in a function make little difference to an R novice.

Dear authors,

Can you please specify until when and where exactly the source code of your 'software' will be available? So far, I could not find any updates regarding this in the article, and making these accessible in a machine readable format would be good practice for your type of publication.