giggles-is-you VS ludum-dare-34

I second gloss! It's a bit limited (no sound, fonts, nor even text centering, but you do have support for vector and bitmap graphics, color manipulation, mouse, keyboard, and animations), but it's so, so easy to use that I not only recommend it (or the similar Code World) for anybody's first game, I still use it for my newer games.

My Haskell reimplementation of Baba is You is also only using one screen.

The main limitation is lack of support for sound. It also doesn't support centered text out of the box (but is easy to implement), and only supports one font, which only supports ASCII. There's also a limit to how many transformations you can nest, but that's an OpenGL limitation, not a gloss limitation.

not for an arbitrary Picture (at least not easily), but it is possible to get the dimensions of text s :: Picture.

My ludum-dare 34 entry does have scrolling, and some images which are only visible in some screens but not others. I didn't do any effort to load and unload them as required though, I just keep everything loaded at all times. One potential difficulty is that this game uses Haste to compile Haskell to JavaScript, soI don't know if your framework supports that.

There are quite a few approaches. Personally, I have only tried Haste, once, but I do recommend it, as it was quite easy to get started (I hear that compiling ghcjs can be pretty difficult by comparison) and it was also very easy to interact with existing JS libraries.