5imp is intended to be a set of lightweight guidelines to introduce tabletop roleplaying games to new players. A game master (GM) can use 5imp to run Systems Reference Document 5.x (SRD5)-compatible adventures with players of varying ages and/or math skills.
This does not mean 5imp is a stand-alone set of rules for new game masters; on the contrary, introducing new players is often best done by an experienced GM who is familiar with the spirit of role-playing games. Most of the below is very mechanically-focused, but the magic of role-playing games is often the narrative flavor, not the raw number-crunching. That said, if 5imp is helpful for you as a new GM, by all means make use of it.