Fun and beautiful game from what I was able to play! Unfortunately I'll have to replay to see more as the game is stalled on a black screen after being freed from jail, even when restarting and continuing. Also I think the unable to access the inventory is a resolution issue, I don't have the arrow as someone else mentioned but my screen is an odd resolution and since its full screen only its likely the sides are cut off.
Edit: Looking at the screenshots the sides are absolutely cut off if you dont have widescreen, I'm only able to see half the piano in the saloon and the man sitting at the bar is at the absolute edge, even cut off slightly if I remember right.