The game actually loaded for me after zooming the browser window out!
The game has cool graphics and music but the gameplay needs some polishing. At first I did not understand what the controls were but you included those pretty well using a button.
Improvements: For example, what do I get if I kill the enemies? Is it just dont-fall-off-the-road game? I feel I want to get some objective why I need to kill the enemies and what I need to do next. Also the gameplay loop could then move to a bit harder one.
Also not sure how it fits to the theme.
I feel this game has good potential which make this a much nicer WoW like game!