IMHO, for tools like that you should focus less on features and more on usefulness and easyness of the tool. For example, neither context menu nor keyboard shortcuts work in this tool.
If you give me just 5 features of photoshop, but which can meet my professional demand, I think that's a good to go.
If you give me just 5 features of photoshop, but which can meet my professional demand, I think that's a good to go.