This is a really neat and unique game! There is an impressive amount of polish and I really like that you give out enough gold to allow me to really experiment with the different block types! It would be helpful to be able to select and move a group of blocks at once and to be able to rotate blocks with the mouse scroll wheel.
My preferred strategy was a long chain of splitters sending a flood of marbles into a bowl shape of damage, which was both effective and allowed me to fully experience the satisfying bounce of the marbles!