This was very fun to play! I love the art style and the way that the level grew and evolved over time, even the aspect ratio! Enjoyed all of the little details in the foreground/background as the level progressed.
I was hoping I could pause the game, but this might have been by design though, for players to play the game in one run/playthrough, with no pauses, for a true, uninterrupted high score.
Great job!