Essentially unplayable due to bugs. Perhaps the bugs are specific to my browser configuration etc (Windows 8.1, IE11). I get no sound but according to other reviews, there is meant to be sound, for instance.
Lunge attack does not seem to work when facing left - is this a bug? It is a really weird game mechanic if it is deliberate. and would deserve having a warning in the controls if this is the case.
The "don't kill black rabbits" level refuses to progress, and just restarts, if you eat the rabbits in an unexpected order. Eating the left ones, then the right ones, then finishing off the ones in the middle is a perfectly feasible way to complete the level.
Even when I can get lunge attack to work its effects seem very unpredictable and difficult to control. I also found that "double jump" doesn't always seem to work. The character is very "skiddy" on platforms, particularly when lunging, and this makes pixel-perfect control impossible to achieve.
I quite like the theory of the game mechanic - using "super-movement" sparingly to navigate the harder aspects of a level. It's just that this game's controls do not flow at all, whether moving normally or using your extra boost.