I really like the idea. Very creative.
It took me some time to understand how to use the spears correctly, but later it was really nice.
There are some bugs tho. Sometimes i have spears in my inventory but can't use them at all.
I also wonder if there is any end to this game? I only got to score 9. But for now it seemed that you wander randomly and endlessly.
But overall it's a fun idea!