This feels like a fun inversion of the classic brick breaker games! To expand on the concept, maybe it would be cool to also add a jump and have the platform youre walking on slowly fall apart as well :)
Maybe it would have been nice if the placeable walls spawned more frequently as time goes on, I think after around 40-50 seconds all of my walls were gone and the new ones spawned so rarely that I never had more than one wall at once on the field.