Wow, I think this is the first UE4 2D platformer on Itch I've seen! Nice!
I liked how the javelin could be used as a stepping stone in addition to a weapon. In fact, it was the only way I was able to get out of a few pits I had fallen into.
My only criticism is having the player start back at the beginning after dying. Yeah, all the enemies are dead, but it's still a lot of backtracking through terrain you've already seen.