This game has good ideas, but the execution could be improved. It's nearly impossible to break a considerable amount of blocks just with the base guns. It becomes frustrating when you have no options to progress. I guess the shop should accomplish that function, but the path to get enough coins becomes really slow as you have no options but wait until you lose multiple times. You can try implementing an aim system or a bomb-shooting system to increase your destruction area. Giving a bigger variety of ways to accomplish the game's purpose will make it more enjoyable and diverse.
Good job!!