Yes, I created a few games in auto it. Most of them were unpublished because they were in various stages of completeness.

Is it doable? Yes, and many, many people here started with Autoit before BGT became a thing. Dragon apps is one example, operation black square is done entirely in autoit. Should you do it? You can, though I wouldn't recommend it. It lacks some more advanced features like structures and isn't really designed for game development, though it can be done with the right libraries. I would suggest you take a look at Pure Basic. You will be able to cary over many things you already know from autoit here, (IE just like in autoit, pure basic starts and ends blocks with If/EndIf, While/Wend ), haas some more advanced features that will come in useful when making larger games, is cross platform if you're willing to work around some bugs, and has a very good debugger. Then there's also BGT, which is also an option but I personally wouldn't suggest it because it isn't really developed anymore and you can't really make programs apart from games with it, while pure basic, and autoit for that matter are much more versatile and, IMO easier.