Love the idea and the gameplay is introduced and presented well. huge props for the tutorial it's short and to the point and tells me everything I need to know. I would've liked to see more gameplay because after using the dice you're job is done and you just watch. There doesn't seem to be any room for strategy or active gameplay. A good example of this would be the ability to move dice around mid-wave to defeat enemies
As for visuals they look great! they are clear and communicate everything they need to. The only feedback I have is that the art lacks a unique identity. I'd like to see a little more then just fanstasy tower defense (but that's a small nitpick)
You should be very proud of what you've made. I hope continue designing, developing, creating! :D