That first photo is likely a worm of some kind. It "oozed" around like most worms do.
The other's photos aren't very sharp. The Gastrotrich looked fairly sharp on the computer monitor prior to snapping the shot. I guess that may be an illusion just like movies. The sharpnes of a moving image of a movie is somewhat of an illusion. The individual movie frames are slightly blurred for a more pleasing transition from frame-to-frame.
I don't know what "shutter" speed the camera uses. It seems to control image brightness by some other means. I need to keep the substage lighting quite dim to stay in the camera's usable operating range.