A 16x16 version is planned at some point, however I also promised more 32x32 sets, which is the field I am currently focused on delivering.
As this is one of the latest releases, it will get more versions down the line. The release order so far always has been 24x24 first, 16x16 second and 32x32 as final series.
I also offer to resize specific icons as a commission, in case waiting might take too long.