I know that at the moment there is no support for mods in the Epic Games Store, but they are planned in their roadmap (https://trello.com/b/GXLc34hk/epic-games-store-roadmap).
In this regard, do you plan to release any tools for creating mods in the future? This will prolong the life of your game, otherwise the game on the same levels will sooner or later get bored.
p.s. I heard about your plans to release DLC / updates, but the community will "fill the game" a more quickly.