One of the most important things about a sandbox game - or just about any game, really, is interactivity. To be able to influence the game environment through your actions, and in turn, the ability of the environment to have an effect on you...that is one of the most engaging aspects of games.
Do you feel Dual Universe is a very interactive game, currently?
What can be done to increase the amount of interactivity in this game?
I think Dual Universe is quite interactive, although the degree to which it is can still be improved. While you are able to change your environment in a variety of ways through the build mode, I still think there could be thing to improve the level of interactivity in the game.
Take for example, the presence of water. While some objects are able to react to water, not everything does. The avatar is unable to do things like swim or float in the water, for instance. But this is just one example.