It took a bit for me to understand that I couldn't use the outer edge for trapping, but once the concept clicked it went pretty smooth. I'm not sure if I understand the incentive for buying more regular shapes in the shop, given that you never seem to run out and it would just reduce your deck's consistency. Some of the shapes are certainly worth adding to the deck, but I kept passing on the normal stuff and kept winning.
In any case, this is creative and I like the music! Nice work!