You're a green cursor that must highlight words whilst avoiding red
G characters. Welcome to PacVim, a game for learning Vim by Jamal Moon.
The readme has detailed installation instructions, which is great for beginners, and is launched by running
pacvim rather than from within Vim itself.
To complete a level you have to highlight all the words, so it's a bit like eating the Pac-Dots in PacMac. The implemented commands include
hjkl for movement,
e for word navigation, and
$ for moving to the end of the line. There are many more commands which are documented in the readme.
It's written in C++, but you can create your own levels (maps) with text files.