It looks like not all reviewers have understand the development cycle of this game, so we would like to open and explain that. Development Cycle -section has been now added to the store page.
The following picture below explains how the development process is proceeding. In the center of the picture is final stage which is Full Release. Before that we are focusing to points 1-3.
Because development cycle is mainly managed in this order, it is possible that gameplay length, graphical style or challenging of the mission are not enough for some players in the current stage. However we are working to make this a great game to play! Fasten your seatbelts; it's going to be a bumby ride!
The most humble thanks to you for supporting Early Access game!