Challenge/precision/etc platformers aren't really my thing, but I can admire this one. The main mechanic is super cool and seems to have lots of potential. I'd like to see it be a bit easier to control, particularly with aiming the power spear. Like I've seen mentioned in other comments, having a bit of "coyote time" would be very nice too.
The visual style and overall aesthetic/theming is awesome and makes me want to see/learn more about the world. The snappy sfx for the power spear is really nice too.
Really really good work!