I know that polycode is not stable yet. There is an issue with polycode studio with editing objects. After while of using polycode studio it doesn't seem to save things when you save changes to an entity. There could be some error that happens and doesn't crash polycode studio but doesn't save edited objects after that or something along those lines. I will test and document the problem in more detail.
Also when creating a new file of type sprite nothing comes up. You can't add anything to it.