After using the tool yesterday, I have some quick feedback. I wanted to save the card image as PNG and it was the 3rd button that finally was the correct one, so there are clearly some usability issues.
1. "Load Card file" -button is where the "main save button" should be because it's the first button on the left after the card image. This is the place where users will start after their card is ready. (I pressed this button first)
2. "Save card file" -button is a bit confusing. Something like "Save as ecf-file" would better describe what the button does. (I pressed this button second, probably because of the "save card" part)
3. "Save as PNG" button is what I consider to be the "main" save button. It should be where the "Load Card file" -button is right now. Its current position is weird because it's in the middle of the editing stuff. (I finally found this button when I stopped to think)
Sure, had I really examined all the buttons, I would have found the correct one the first time around, but web users generally want things done fast and don't bother to read everything unless absolutely necessary. I think that with a more logical button placement and labeling would improve this tool. It's not a big deal of course, but an improvement nevertheless.
The ability to save card files is pretty cool but I'm guessing it's not currently working, yes? Because it's not working for me. I save a file and tried to open it but nothing happened.
Anyways, keep up the good work.