Very cool concept, I reckon that this type of game would work well on consoles.
I found it a little easy, maybe you could make the gravity well a little less strong so it doesn't trap every object, and they only redirected / don't stay in the well when you move it around. I found the best way to beat enemies was to catch a bunch of stuff in the well then put the well on top of the enemies.
Possibility even have a limit on how long you can use the gravity well.
In any case, good job