Holy moly! This is such a simple and yet super sharp entry I think! It just hit something in me, where I had to keep trying again and again to beat my previous score :D
The music is great, and you have done an excellent job pacing the difficulty of the game I think. As a first major project in Javascript I think you have done an awesome job honestly! My first javascript project was nothing compared to this. I hope you had fun building it, I definitely had great fun playing you game :D