I'm sorry, but your app lacks a lot of required functionality. Even for a lightweight time tracking app.

The statistics are very pretty but not very useful. The lacking of printable, full reports on project bases, is a dealbreaker for me. Also add a text field to the time entries, tags are often not sufficient. Also no date filtering? Only full hours, no half hours? The sidebar says I logged time for yesterday, if it was actually today. The edit userprofile link doesn't work.

Haven't you tested your app at all?