Fly'N is a fantastic, brutal and beautiful 2D platformer. The gamepad controls, platforming and level design are solid and the game provides a challenge even for players experienced with platformers. There's enough incentive to 100% levels for the unlockable concept art, puzzle rooms and easter eggs in the home areas and, on rising lava levels, solely for the satisfaction you feel if you manage to pull off a perfect run. Having no reason to replay levels or improve my skill to perfect them is an area where I'm let down by quite a few indie platformers, so it's nice to see another one doing it right.
Acquiring new forms--each with unique platforming abilities--and being required to shift between them adds to the fun, and they're introduced at a rate which revives the learning curve just when you think you're getting comfortable and keeps things from getting too repetitive. Regardless of which form you're in you'll also be required to shift between two worlds where platforms, collectibles, obstacles and hazards appear and disappear--adding another element of timing and skill to the formula, similar to the new Giana Sisters.
You'll die a lot trying to perform well on the timed levels; fortunately, there are plenty of stages you can explore at your own pace in between these skill checks and boss battles. Watch the Steam trailer if you're considering picking this up; in this case it accurately showcases how the game plays and whether it's something you're likely to enjoy.