Nice physics, felt at home right from the start. I'd love to see a feedback as to my position in the field as I'm racing (maybe each time I pass a checkpoint?), and at the end of a championship, a final tally to see how the others did.
I've had to restart level 38 at least 4 times now because of portals glitching and getting cubes back to the bottom (I haven'tfigured out how to get back there to fetch them). That's very annoying.
The targetting needs work. I was trying to use teh superior range of the plasma sling against the stationary guns in crystal cave and the flame throwers, but the AI is too dumb to attack at range (and hit).
The point iof stitches is that you can equip items that boost your max HP, and you might want to buy the HP for that before you go exploring.
Looking over my badges, it took me 8 days to get the first 3 (and hit level 44) and another 7 days to get to 51.
 "Take It Down")
 "Async Racing")
 "Portal: The Flash Version")
 "Animal Migration")
 "Puzzle Room Escape-21")
 "WHY ME?")
 "Thanks Tanks!")
 "Quotes - The Game")
 "Neon Rider")
 "I Can Hold My Breath Forever"){kind=icon}
 "Alien Shots")
 "Disney Fairies Similarities")
 "SPOT THE DIFFERENCE")
 "eco motion team")
 "Sums Number Game")
 "That Gravity Game")
 "ClueSweeper")
 "Dream World"){kind=icon}