No plans at this stage. I'm committed to PWYW with a minimum of $0 and a default price, and to allowing purchases/downloads without an account. If Valve implements these features, I'll definitely consider it (that seems unlikely though).
Hey there! First things first, AMAZING game <3 Love it to bits! A friend told me that Steam appears to offer the option to set the game to free and add "Support the Devs" DLCs. While it won't allow people to add custom prices you could set like 1$ 5$ 10$ XX$ DLCs as an option? That way you'd probably get way more exposure to this fantastic game than itch on its own.
Sure. Looks like your confusion comes from conflating exposure with distribution, which are not the same thing.
In case that's not clear enough, I'm not chasing exposure on Itch. I'm using their storefront infrastructure so that people who find out about my game outside of Itch have somewhere to buy it with fewer strings attached than any other distribution platform.
FWIW, I tested that Hive Time runs through the Steam client when added as a non-Steam game before release. If you really want to play it via the Steam client, that's an option.