Don't just start the game when the page loads - make a start button. By the time I read the instructions the guy had stopped bouncing and I had to refresh. Which brings us to point two, which is make a reset button just in case the guy stops bouncing. Also, don't put a door with an Exit sign over it if the door is not the exit. Maybe an Exit sign with a big arrow pointing to the right.
And seriously, only one level?
Not bad. Controls took some getting used to. Coming back to life inside a wall is annoying. After death take out the "click play" screen and just bring me straight to "press space to begin." Unnecessary screens breaks the flow.
I like pong for what it is, but it's only cool if you're playing it on an Atari or something. 1/5 because pointless remakes should not be encouraged. You didn't come up with it and you didn't improve it. What's the point?
About as entertaining as the real guitar hero, which is not very. But I recognize that it's just not my thing - the game itself is put together well and plays fine.