On level eight is it intended to take the second cube to the end and use it to cheese?
Not intended. But cool that you figured out how to do that! Can't believe I overlooked that when designing the level.
I like when games have 'exploits' like that. Its fun when a game rewards you for thinking outside of the box. For example, level 10 has a HUGE exploit/shortcut you can use to skip almost the entire level. And there are probably more out there I don't even know about!