Thanks for playing and the great detailed feedback. I agree on the progression. Typical game jam crunch. I had more planned. I added the upgrade points at the end of the jam, because I didn't have the time to implement a way of earning skill points, yet had already implemented the basic upgrade system. It was more of a placeholder, so you could see how the system worked :D
Glad you enjoyed the choice of music. I was going for the juxtaposition of destroying the city but with a jolly backdrop. I also had sfx for destroying the houses, but the music is too loud so you can't hear them if your not zoomed all the way in.
I will keep all this in mind and learned a lot for my next game jam through this experience :)