First, an update with respect to the status of pushing this to Harbour.
I am linking against some libs that are not allowed to link against yet.
I wrote an e-mail to the Sailfish Devel mailing list explaining my case and got the reply that they will look into allowing more libs.
However, there is no assured timeframe when this will happen.

Second, thanks for the feedback.
The Q To-Do UI is still very much the generic UI.
I already did some minor adjustments to match the Sailfish look and feel but didn't have the time to do more yet.
I will certainly keep your feedback in mind and will try to improve the look and feel.
Personally, I like the design language of Sailfish very much and think that the interaction concepts are truly great.

However, I also have some other apps I want to port and lots of other things to do.
So, I hope you don't mind and understand that, after this initial release, it may take some time until I get to improving the UI.