I love your idea of letting people play in browser and giving them the choice to see the game the way that developers do, and sending them the code.
A few things that I've learned on itch.io: majority of the audience are game collectors who appreciate the artist- reading dev logs, seeing updates, downloading sprites, looking at code etc, and people are willing to drop a few bucks on quality- I know I have and I'm working with a tight budget.
When you can bring every step of the process of a game into the view, people love to see how you did it. Sketches of background/characters, sprites and animations (run left, attack, etc) and the code and how it all comes together. Its a beautiful thing
Personally I dont like posting my art on public platforms like youtube/instagram/twitter, it can feel so fake. But if people are on itch.io and scrolling around they are in a different mind set than someone scrolling on insta/youtube and can see past the bologna posts/ buskers and see the real artists who put time and thought into their final products and want people to use them.
$2-3 is a great price, it covers fees and what not. In my opinion $1 causes more problems than it solves depending on that website. Bundling things together helps customers save too. you can make iframe widget to copy paste into post that you want to bundle (example in my signature)
Best of luck in your enDEaVors
Sarah
(you can make an iframe widget in your dashboard and copy paste into signature like this or in posts you want to bundle)