This is an old PC, without a graphics card, it is an optiplex 755 dual core 4gb ram.

The monitor is 1280 x 720 maximum.

Here I do everything, using aseprite (version compiled by myself from the source code)

I made this art at 256 x 256 and then when finished I adjusted the measurements so that it was to my liking.

After that the other thing is the usual thing, export to the size you want and that's it.