itch.io

you need to press space bar 

Yes our level designer was a bit hard on it.
On the tutorial you will find if you pick up a few of the dung (since you go faster the bigger you are)  and then pick up the full line then hit space to swap direction and run back to collect any missed you should be able to make it back to the start in time.

Once you get the hang of it it should feel more sensible, most of the levels require some testing to get a feel for what you need to pick up first etc.