Congratulations on your first unit. I hope it is the first of many.
Considering this is your first unit, you did just a wonderful job animating it.
On the fidget... I think there is a bit too much movement. The spear should either remain planted or mostly so. Wiggle it if you want, but having it come down so far will be distracting. Also, the nodding down should be slow, the snap awake should be fast.
On the death, good idea. Reasonably well executed. But much too slow. Given that it is a basic flop death, it needs to be fast. As he is falling backwards, his weight is unsupported by his legs, and so should just drop and flop. If you want a slower death, look at the units where they keep the legs under the body for a few seconds. I did this in the viking and in the troll preview too. Just variations to play with. Liking the tummy grab.
On the victory. It would work better to have his arms come slightly forward and basicaly go straight up rather than the sideways flapping approach.
On the attack. Well done. The spear has a nice smooth attack. Looks very realistic. There seems to be a slight foot slide on the return, but it is not distracting I would suggest that he lift his feet slightly more on both the attack and the return.
On the fortify. The foot slide here is more noticable and consequently more distracting.
Over all:
Good to very good animation and modeling. It is definately a keeper!
Really hard to believe you got it so right on the first try.