Yes, emacs runs very well under termux, complete with swipe to scroll.

For typing, Termux's "extra keys row" makes ctrl and meta combinations possible with your favorite keyboard: https://wiki.termux.com/wiki/Touch_Keyboard

...or you can just use Hacker's Keyboard (but I find it too cramped).

Git also runs fine under termux if that's what you use to sync your org file.