Very cool concept and good execution! There are some balance issues though. It's a bit too fast paced to really plan out a complex strategy, and you can actually just perpetually stay completely safe by just surrounding your core brick with just a single layer of gold bricks and just replace them when they are destroyed. Reverse breakout games are a bit tricky because building up with a ton of bricks can actually make you more vulnerable because then the ball gets stuck in your back lines.
All the different types of bricks are incredibly cool. I hope you keep iterating on this!