Interesting concept, I liked the fact that you mixed things up a bit when introducing the need to first collect the "Coin" before being able to identify which one of the critters is the intruder, and since you have one shot it really fits the theme.
However there are issues, first of all the character moves WAY too fast and twitchy ! This makes it very hard to control, and then there seems to be a bit of collision detection issues with the platforms sometimes you can be a bit half through the ground when you land on certain spots.
I'd say if you want to somehow keep a bit of speed on the character, maybe try to have it build up speed before going so fast this could be somewhat of a middleground between fixing the control issues and not really slowing the character down (although i.m.o it would be better to slow him down at least a bit)
Despite all this keep at it, it's a neat concept and it is quite fun to play appart from the previously mentioned issues :)