Thanks for the video! Glad that you liked Nymphiad.
You can use Shift, Z or J for running. Also you can turn always run mode in options. In this case holding run buttons will make you walk instead. Guess it will be more convenient for you.
PS: game's title is made up from 2 words "nymph" and "Iliad" (Greek mythology references). So it should sound something like [nɪmfiəd] :)