.rar files aren't executables, there a repository which means they hold files, they don't execute them, download either winrar (paid) or 7zip (free) and extract them, inside the extracted folder you will find the exe file
I suggest either having a character creator like terraria or a easier way to add your own skin like in minecraft, one way to make it easier would be to make the skin png files into 1 png file
I found that the movement was a bit sloppy and i found my self either running off cliffs or into spikes, the story is fine fits a standard game, i also found that when moving the character was on the corner of the screen making it hard to see what was infront of me without jumping back. anyways good game but a lot could be improved :
