Not bad!
The tricky thing with 3D stuff and especially GMOD is getting the goofy walk/hop cycles to then smoothly match up to their standing hold positions without dipping into the floor for a split second or stopping jankily. So with just a tiny bit of effort, and maybe even animating the bulborb's leg a bit when he used the Worm's Shotgun, there'd be extra effort marks to hand out.
Otherwise, good for a quick laugh. :P