You should add a description and screenshots so that people will be tempted to play past the first zone.
I love the style and the gameplay. (timed knockout is a favorite of mine.) How long did it take you to make all of this? The presentation is stellar, besides it's rare to see a 64x64 game that doesn't struggle with depth percetion.
P.S.:
I think I may have found an audio bug? To replicate: ram as hard as you can into any pole. The audio deforms until it goes silent. However, the audio resets every time you finish a lap.