The team at Supergiant had originally said that Hades would includes cross-saves, which would let you continue your game on both the Switch and PC versions. That feature was meant for launch, but got pulled due to issues. In an update, Supergiant says they're still cranking away on the feature, but don't have a timeframe for its release. Check out the full statement below.
Cross-Saves dev update: We are still actively working on this feature and trying to get the important details of it right. The nature of the work means we currently don't have an ETA for when it will be done. We will keep you posted, and thank you for your patience and support.