That is weird that you never got any power ups. I usually get them 2 or 3 tanks in. They also show up on the minimap as little green dots.
Music and sound are what I consider my biggest weakness, so I'm glad you liked them. There was a lot of experimenting with BFXR and Bosca Ceoil for this jam.
I'm glad you enjoyed it, but it's way better with power ups. I hope you try again.