Mmm, Arjak, it is very strange
What plattform are you using to test the game? Maybe an emulator (what emulator?) or a real PC Engine?
In fact, the Action icon DOES many things. If you click in the door with the action icon selected, you go into the house and you see a cutscene. You can speak to the policeman too with the action icon when you have gone out of the house (if you do it before, the character says "I don't need anything from the police now"). And in the same way, you can interact with the ambassy and with some objects (I don't want to spoil!) using the action icon. It seems like the action icon doesn't work for you, and I don't understand why... Maybe if I know what plattform do you use, I can debug that problem...
As far as the lack of sound and deepness, keep in mind what I said in my first post: this is only a demo, I want to test a new kind of game that we can make for the PC Engine, as I don't know homebrew games of this type for the PC Engine. In fact, registering the 26 audio tracks has been terrible... but of course if I go for the Deluxe version, the game must grow in those concepts.
The fact that the character walks only in 2 dimensions is due to this demo has been quickly programmed, and the backgrounds have been quickly chosen. Of course in the deluxe version we can use 3D backgrounds and the character can walk a bit in the third dimension. It is not a major trouble for me (maybe the main problem is drawing 3D backgrounds).
And last, but not least... yes, the character is from "Bad Dudes vs Dragonninja", but... do you see that the woman is NAKED? I repeat: what plattform are you using? I must buy it too!!
Thank you very much for all your feedback!! I hope that we can solve the problem with the action icon in your plattform, in order that you can enjoy the demo. Let's see if anyone more has the same problem too...