Depends on what you mean by 'relevant'.
Having some form of art is always going to be a benefit for you. It's the no.1 complaint I've received with Stuck in Sutton. The main benefit I've had from going artless (apart from one picture) is the fact I've already turned a profit. It's also allowed me to get updates out every 1.5-2 months, which is a solid pace and I do think has helped me build an audience. Finally, being HTML based has allowed my game to be playable on just about any browser and any website that'll host me.
Ideally, you'll want to do something like
Hard Times in Hornstown with character art to one side. Both
Female Agent and
Blue Swallow are pretty popular too and have paperdoll avatars of the MC. All three of those games are very text-heavy and are doing good numbers on Patreon (both Hard Times and Female Agent are making above $5K and Blue Swallow is at minimum making double what the vast majority adult games ever make on Patreon, even at an early stage of development).
I'm also going to give an obligatory for the love of God don't make a sandbox game for your 1st project. Even a game as small as Stuck in Sutton has given me plenty of headaches.