This is infuriating fun.
To those confused by loops (or lack thereof), which way boxes will go first-second-third etc. at a junction, the existence of 3-way splits (sadro25), and so on, there is a good tutorial in the game Factory Idle. Might not be bad to put it here, too. :)
(Part 2) (I didn't even know that you could go over 100% on these or that you could buy upgrades for 1K blocks per 1% until I read another comment, and sure enough, there's a plus at the bottom right of the battery and engine screens.) Or am I missing something? I'm at +302% Energy/Battery and +322% Power/Engine, and I'm just now getting somewhat close to the bottom in 30 seconds, but still running out of energy.
Okay, so... People seem to be saying that Agile Red is soooo hard and Powerful Red is easy -- just spam the turbo. The only conclusion I can reach w.r.t. these assertions is that people have been collecting blue (battery) and green (power/engine) bonuses for so long that they can't go slow enough to avoid the enemies, and are so powerful they just blast to the bottom in << 30 sec. After a day of playing, the only unfinished achievements I have are Kill 1000 Bugs, Upgrade Hornet Fully, and Powerful Red. There is NO way, even with fully upgraded H3, B5, T4 and S4, to reach the bottom in 30 seconds unless Battery and Power are upgraded, either by destroying enemies or buying the upgrades with blocks.
 "Cactus McCoy 2"){kind=icon}
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 "Notebook Wars"){kind=icon}
 "Doeo"){kind=icon}
 "Sierra 7"){kind=icon}
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We didn't change anything yet, can you describe the issue?