What a great game! I had a lot of fun playing through it. I like the concept of the game and how the dice with more sides are tougher to kill but also have a chance to reward more coins. You did a great job of executing on your idea and the end result is a game that looks nice and plays really well.
If I were to offer any critique I would say that the game felt really difficult for me until I started building almost all turrets with a few cannons here and there. The other two tower types just didn't seem worth the money to me, but I'd be curious to know if anyone else had success with those. That said, it's a game jam so no it's no surprise that there might be some balancing tweaks to be made. Balance nitpicking aside, the game is great. Well done!