Ah, Nitrome, the EA of browser games... ( not implying that he likes to load us full with DLC's xD)
Another high-quality action-platformer with a very neat arcade feel to it, with cute pixel art style, mesmerizing music and interesting enemies in combination with level designs.
Love the option that there's both a co-op mode and a solo one which don't differ at all, meaning that playing alone is totally ok and heck, you can even play co-op completely by yourself! :D
Some of the flaws would probably be the repetitiveness factor after a while ( I got pretty bored from level 22+ onwards) and also the slightly uncomfortable controls in some sitations.
Nevertheless, this is and will still remain one of the first game's I'll come to when a friend visits me and we both want to have fun ;) Great job! :^