Like one of the other people below, I initially ended up with a huge body and a tiny little t-rex arm that couldn't even reach the things attacking me. Then I read the description again and saw my mistake.
I quite liked this. The grabbing and bringing back to the mouth motion feels really good (other than it not initially being clear to me where they need to be dropped, and it sometimes not eating even when I think it should have). I like that the upgrading of the arm and body isn't done through a menu with upgrade points or something, but actually with the actions you take -- that feels very cool and diegetic.
I think this is the kind of game that could get a little tedious after a while, though I'm more running into a difficulty wall; i.e. at some point I simply can't move my mouse fast enough to deal with attacks from three directions. I don't know if that's just a me problem or if maybe there needs to be some way to deal with that more effectively?
Anyway, cool game!