The hard badge is a lot easier than it looks. The rocket actually propels you with real physics. So point the cart towards the sky to fly while doing a handstand and when the rocket runs out of juice do a flip and land.
These people have some seriously jacked up weights. The walkthrough says a lot of pointless crap, and the hardest part is being able to click on the correct spots. Seriously, the entire object should be clickable not just one part of it.
Its alright, but cops should come or something. The fact that your car will always stay on the same x-axis is kinda lame so you need something cool to add to it.
If you hit enter you'll move the next checkpoint. Thats kinda weird. Also, this game can't decide if its a puzzle based or action based. Honestly, if you know where the danger is, it shouldn't be a project to get around it.