Interesting concept. The explosions look really cool, and looks like someone animated them by hand, good job there! I wish the speed of the grabbers was faster, and I think they should be lower on the screen, it feels like half the screen is unused. Fun game overall, good job!
Ps. It might be cool to stick the grabbers on tracks, so people know they only move along the tracks, I think that will open another dimension for level design too. Just my unsolicited ideas :)