I made this in Pixelorama. The process went fairly smoothly until I compiled the screenshot. Cloning a layer often produced a blank layer or a previous state of the layer. Creating a blank layer or loading sprite layers shorter than the number of frames in the project caused random sprites to be added to the layer. These sprites had been duplicated and merged into layers. However, Pixelorama would stick a couple of extra sprites into unused frames. It's like the program remembers past commands and executes them randomly. Since this only occurred with the larger project, my small amount of memory, 4 GB, may have been contributing. I found workarounds and will continue to use your product. I have no income and very much appreciate this tool that may help remedy the situation.