After adding a new test criterium to the test plan I cannot seem to remove it anymore. 
Nice idea would be to drag it to a bin for deletion.

Make a Overlook testplan at a bug from Damn Bugs

Sub test cases under a test case would be nice. For instance you are to test a webpage/software that has popups. You might be testing one page but each popup would have subtest cases to test the popup.

Ex:
Click popup

1. test adding to the popup
2. try closing popup

Click popup 2

I'd like to add a feature request:
To add the ability to customize supported browsers/platforms.
E.g. When testing responsive sites, you'll need to add tablet and mobile test platforms (with multiple software versions).

Would like to duplicate a test plan into a different project.  Helpful for apps that have a mobile and a web presence that mirror functionality. 

Pass/Fail buttons have similar color while selected and non selected.
Suggested to make it more transparent while non selected.

Export Test Plan is not possible?

Thanks!

Got an error when trying a test plan a second time. A user should be able to run a test plan multiple times. This test plan even had an added step

Or some other way of formatting the text within test cases and notes.

Very nice project, but it is currently mandatory to create an account to save off-site results of a test case. Best case scenario is the ability to give feedback with just the mail sent to the tester. If this is not possible than it is a necessity to be able to login (not create a whole account) to save the result. And preferably stay logged in when you click 'Start'.