I took a look and here's what i think:
-The ground texture in the big cave look funny when it's metal. I'd use concrete to make it look better and more realistic
-1st sshot, misalgined'
-2nd sshot, this hump has odd shadows
-3s sshot, at the green square, make a ramp/hump so you can jump to the red circle jump. Also make some humps where the green circles are.
Well, that's all i can think at the moment. Hope it helps!