Wow, this is a lot of fun, I really enjoyed figuring out how best to destroy blocks in the environment in order to access the shrooms! The music was fun, and the controls felt very good and responsive! I just wish it was a little bit longer and had more levels, but this is a great submission; awesome job!
Edit: another thing that could be cool to add could be new gun types, like maybe a shogun can blow up a 3x2 section in front of you; could make it tricky to figure out how to use it best to break the blocks in the level