Nice man. I like it! I think one of the flips (first slip, and the brain dropping back in) could use little more hang time. right now they're both around 10 frames duration. My first instinct is little more hang time on the slip, ~10 to 15 frames, and work in an air stride while body is upside down in the air. More hang time in the second could work too, but a bit more additional work and rework: after brain drops back in he flops up, little more hang time, and lands running as if continuing from before slipping, then come to a stop wondering why he was running in the first place. expression changes to your looping point as realization/remembering. then the sneeze, cycle starts all over again.
the other is a creeping bit of quaking ala raving rabbids would be nice when the expression changes when he catchings his brain.
I tried a bit of the shaking fear, but it wasn't reading well. I can revisit it. I'll try to implement a few of your other suggestions if I can squeeze them in.
looking cool man, the thing that sticks out to me is I'm still missing the beat where he realizes that his brain is in his hands and he's freaked out about it (see syncsketch). Also I know this is probably more to do with the rig than the anim, but I'd like to see more squashing when he lands on the ground, it seems like he can stretch okay, but he doesn't really seem to ever compress from his pill shape
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the other is a creeping bit of quaking ala raving rabbids would be nice when the expression changes when he catchings his brain.