We are always happy to hear some criticism towards our game!
As for rooms, we will definitely add more rooms, locations etc, so there are places where a player can go.
As for tutorial, it's just a prototype, so we wanted to pay more attention towards basic mechanics of movement and fighting, but UI will be added in our later updates.
This gun is supposed to be melee for now, the long range shots will be available later. However, we agree that the animation has to be redrawn, so it is understandable that this is a melee attack.
As for background, this exact location is designed to be sort of "abandoned", so we actually wanted it to look empty. However, I guess some "signs" of being abandoned should be added.
Hope you will like our next updates and will help us make our game better!