HARD badge is not too hard. 1st: Upgrading anything to MAX, EXCEPT Hull. 2nd: Use the Brake in the beginning often. 3rd: Don't use speed gate [including sliding over] And finally: get fuel refills when possible. Hope that helps!
I got the "Infinite Level 90%" badge. Here is a tip: If you use less attempts to beat a level, the % will increase higher after you beat the level you're in.
The game is just like one of the section in "Castlevania: Dawn of Sorrow", but with more puzzle/thinking elements. In my option, it's simple to play yet challenging, despite the fact that sometimes the arrow key is not responding when switching modes. *Faved* :)
The art and the music are awesome, but I don't like the control because you can wrap instantly by moving the mouse fast. Make the movement "go toward the mouse" or use the keyboard is better.