Excellent but tragically abandoned
Really great ability to customise fonts, auto-restore, browse folders. I’ve paid for a lot of text editors on iPad and this one beats them all.
Unfortunately, there are serious bugs with this app stealing focus in Split View, the keyboard jumping around on touch and not being possible to dismiss, netrw breaking after accessing certain folders, etc. Looking on the GitHub page it appears other users have run into these problems and reported them a long time ago, but it appears the developer is no longer active.
I really hope iVim gets some updates and fixes, or that another brave developer picks up the mission of a great app Vim on iOS, because this app offers an exciting vision of the viability of iPads as development machines!