Looks good so far for your first game. The game would be a bit more playable if you slowed the guy down. Also work on collisions (this may require you to spread out spikes). But so far, this looks really good!
I agree with FRUP, and I would also change the image of the speaker when you click on it: to get a little more feedback whether the sound is on or off.
A new version of this scenario was uploaded on Sat Oct 05 16:11:46 UTC 2013
Upadates: Made Collision detection more accurate, made speaker change when turned on/off.
A new version of this scenario was uploaded on Sat Oct 05 17:21:25 UTC 2013
Update: Created a new sprite to match theme.
2013/10/5
2013/10/5
2013/10/5
2013/10/5
2013/10/5