I love the premise and the music! \nn/ >.< \nn/.
Here are my thoughts:
1. Good pixel art. Charismatic and funny. I would have expected more rock-punk vibes in the city, like graffitis or posters of the rock start you play.
2. The first time i played the game, I didn't have any audio, and I thought that was the game, until I finished the level, and the victory sound started. In my second play, the music and SFX worked as expected.
3. At first, I wasn't sure what to do. I would add a screen before the level starts that explains the controls, and the goal is to collect electric guitars, while evading fans and other stuff.
4. The level felt short, there could be more guitars. For example, after getting a certain number, new guitars spawn on the stage.