I can confirm that 1.0.1 does indeed launch now.
This is a good start for a freehand drawing program. All of the actions are controlled by the menu, which is awkward when using with a tablet (I prefer to be able to select the tools using the pen rather then a combination of keyboard/pen since the tablet is usually in front of my keyboard.) So, It definitely needs a tool palette. The lack of a tool palette makes it harder to use Rita.
However, I do like the fact that you can use a single key to use a tool, e.g. P is Pen, A is Arrow, rather then having to use a cmd-key to activate the tool.
I also like that the canvas has no preset size.
It would also be nice to be able to define colors for the "Quick Color Menu".
When pasting a copied selection, it should place it in the middle of the new document window. Speaking of new document windows, they should be larger (or at least one should be able to set the default size).
The steps to zoom in and out are too large. In some cases the picture is either too big or too small.
I also don't understand why there is a 0 pen size setting in the brush picker.
You can't paste other graphics into Rita or can you paste the contents of Rita's pasteboard into other apps!
It should also support more export formats (or just add them to the regular save box in the menu). Right now it only support tiff, but it would be handy to have jpeg, png and gif. I do like that only the visible part of the drawing is exported.
I didn't experience a single crash or odd behaviour while using Rita.
Overall a great start. I'd like to see how this application evolves, in particular with some of the UI and file/clipboard formats.