Aahh~ so many devs teasing on itch and then moving exclusively to Steam 😔
So, personal opinion and situation but I think I'm not the only one, so I'll share:
As a player/buyer, I vastly prefer itch and GOG for their drm-less and platform-lock-less approach. You buy it, you get the files, you install where you want, you get updates if and when you want. I know they have less natural reach than Steam, and you don't get the auto drm effect, but... it feels like a more natural approach to me. Almost like going to a farmer's market rather than the grocery store chain.
Have you considered publishing on these alternate platforms? At least have the demo here?
If not, I'd love to know why, because there's so many devs doing this, and I'm curious as to why :(
By the way, the steam requirements say "Memory: 4 MB RAM", which I supposed is meant to be 4GB?