Brilliant writing, great level design, atmospheric mood, brutal platforming with well placed checkpoints, huge levels, multi-element platforming (jumping, falling, swimming, wall scaling, gliding, etc) and ZERO IAP.
Also, a directional pad was recently added which made the game perfect.
I only got this game last week, but it was well worth the asking price, and is already a steal at this sale price.
Exact-Psience My 2014 Top 10 Games of the Year: Monster Hunter Freedom Unite, Hearthstone, VVVVVV, Battleheart Legacy, Wayward Souls, Bug Heroes 2, Powerpuff Girls Defenders of Townsville, Deep Loot, Monument Valley, Bioshock Honorable Mentions: Traps N Gemstones, Bardbarian, Goblin Sword
I got this back when it wouldn't work on iPods. Glad this got posted. Reminded me to re-download. It works with supported devices now.
On a side note this is actually good enough to get put on my iPad.