Hi, I'm currently running a character collab that I plan on turning into a game/showcase.

My plan is to place all of the submitted characters in an infinitely-looping landscape that you can scroll left or right by moving the cursor to the edge of the window, like this project.

When you click on a character, a window will open showing a hi-res version of that character, and the name of the contributor.

Would it be best to build this in AS3 or HTML5?

Also if you know of any relevant tutorials or script, that would be a plus.

Thanks.

What is best is based on what you already know. Both can be used to make what you describe. However, in the interest of compatibility, I'd say HTML5 is better, because pretty much all browsers can support it out of the box, and it's probably easier to make it compatible for phones with touch events.

You'd be restricting yourself to people using the Newgrounds player (for the time being) if you targeted AS3. Even if you use AS2 for Ruffle compatibility, that's still unnecessary overhead for a "simple" project -- overhead which won't be present in the HTML5 version.

I haven't worked much with HTML5 but I imagine one way you could do it is literally to just have one giant picture and then scroll from left to right using an invisible scrollbar, whose scroll speed increases as you move the mouse further away from the center of the screen.

That'd be horrible for performance, but that's an OK starting point. From there, you can decide to try and optimize it more, by having multiple pictures which load in one by one as they approach the browser viewport, for example.

Sounds like I should probably do it in HTML5.

Forgot to mention in my OP that I plan on uploading it here on NG, so I don't know about mobile compatability.

The use of an invisible scrollbar sounds interesting.