I mean, if someone said, "I've successfully ported Vim to Android!", my first thought would be, "Why in god's name would I want to run vim on my phone?"*
* Ruling out, of course, someone plugging their phone into external KVM.
To be fair, I've used vim on my phone over SSH and it was actually a pretty good experience. Editing is a bit more deliberate of an affair than with a hardware keyboard, but still easier than trying to visually select text on the touchscreen, and no complex chorded keybindings to try to enter.
A now-dead sibling asked about an escape key; on Android at least there are keyboards that have the meta buttons (no affiliation: https://play.google.com/store/apps/details?id=org.pocketwork... is one example).