itch.io

... you know it makes sense that you'd already have found something that works for you in the two years since asking the question lol

That would explain it.  On Windows, there's an "edit" menu on the top with buttons that say undo, redo, cut, copy, paste, delete, and select all. None of them do anything as far as I can tell, unless they have some effect on the text?  If the Windows compiler just expected to find them and slotted them in automatically, that would explain why they wouldn't be hooked up to anything lol

This tool set is simple, intuitive, and useful--it does what it says it does, and I don't often find myself wondering what a given tool does.  On the rare occasion I have questions, clicking the tool and seeing what happens usually answers it.

I'm not seeing a few functions I'd like to that the original had: color, as others have said, and if there's an option to change the canvas size to 8 X 16, 16 X 16 or 32 X 32 to work on sprites, I can't find it anywhere

Prospective buyers should also note that (unless I'm missing something) there is no built in save function.  To save your work, you must click "copy to clipboard," paste the code in a document, and save the document.  Again, fairly intuitive, but something to know going in

Unfortunately, some of the tools that are included don't seem to work?  For example, when I click the undo button or use the ctrl + z hotkey, nothing seems to happen.  Not the biggest problem when working with an 8 x 8 grid, but a bit odd.

To be clear! I find the dev's stance about color functionality ("it's open source, feel free to design your own color functionality") perfectly reasonable.  I'm not going to demand that much extra work for software I paid two dollars for!  I'm just listing my thoughts as someone who fiddled briefly with the software

The best tools for making pixel art PNGs like you would use with GB Studio are  currently Aseprite on Windows and Linux, Pixquare on IOS, and Pixel Studio on mobile.  This tool is for when you need to export your pixel art to .c specifically for use with GBDK (although I wouldn't be surprised if there are other graphical development kits it would be good for.)

Aseprite and Pixquare are paid software, but Aseprite you buy once and own not only the software but any updates they publish for life.  Pixquare I believe is similar, but I haven't touched an Apple device in nearly ten years so I can't say for certain.

Pixel Studio is free with a paid option for ad free and premium features (including making pictures above a certain canvas size.)