While I do not know the exact answer, Puato, I can come close to as accurate an answer as I can to your question.
For example about what you are saying now, if you are using a screen resolution of 128x128 right here:
...then the correct style of sprites would be to redraw them so that they would perfectly fit the 2x1 pixel-aspect ratio we are looking for. Here, I will show you an example:
That is just one way of doing it, and I hope this helps you out truly as a valuable little example right there. ;)
You know, working with “2x1”-styled pixels can sure be a daunting and most challenging discipline to successfully pull off at first, especially for those just starting off in this kind of pixel ratio as beginners... but, with some good constant practice as well as plenty of time and study about this fascinating medium, it can be managed masterfully the more you learn and learn about it as well as how it works while you are pixelling your own new sprite work in the form of a 2x1 pixel-dot style indeed. I mean, even I had to discover all of that quite a serious bit thoroughly myself too when I first began from just a year or two ago, especially if I wanted to preserve the sprites to fit that exact very ratio instead of them looking like a choppy mess with nasty, randomly missing pixels in-between. I am only just learning along all the splendid aspects of it thoroughly and handsomely so that I can share all that newfound knowledge about it with you in order to give you some much vital insight into what this amazing, iconically well-cherished art of pixel style is truly all about.
As such, I most richly thank you so much for the rather interesting question, and I look forward to your fine entry into this game jam. All the best to you indeed on doing that!!! ^-^=b !