Kept not expecting player bounding box to be a circle instead of rectangle (thus stucking on ledges, where some of traditional side-scrolling games would slightly move player up) and dying from spikes when moving from direction where they could not physically hurt in real world, but overall this kind of game looks interesting.
Seeing more mechanics and multiplayer would be fun here, but I guess randomly generated world might limit the amount of possible mechanics if these won't be well-thought first.