Task Manager Not Project Management Software
As best as I can learn, your application manages tasks.
Project management has many, many more aspects to it - scope documentation, identification and management of stakeholders, risk management process, change management process, procurement management process, etc. In fact, 70% of the skills (and related tasks) to project management are the soft skills such as communication (keepting track of oral, written, electronic content), relationship building, trust building, negotiations, mitigation of conflicts, facilitalting people to agreement on the same list of objectives and goals for a project, etc. This is not reflected in your software.
I suggest you rename this, as people begin to belive they know "project management" when they can fly software such as yours, and they do not know they are misrepresenting themselves.
It may be a very good tool to "keep track of" tasks, but this does not constitute project management.
30-year (real) project manager
demo