Pretty fun on gamepad. Controls are tight and level design is good, aside from spikes below the bottom of the screen that you can drop onto in the second world. I like the animations too, the run/attack ones are impressive and the enemies are varied and well-telegraphed.
You should add some parallax on the background though, and maybe consider decreasing the gravity a bit. I felt like I was falling super fast sometimes.
From a fellow Unity guy, you should check out the pixel perfect camera asset, or at least mimic it and render to a texture to avoid mixels in some of the hit effects.