Cool game. Not bad looking.
Here's my advice which you might or might not agree with.
I think it needs more variety. (Upgrades for your bow, Maybe some other enemies or a boss.)
The auto shooting mechanic is interesting. It puts a greater emphasis on positioning the player as the main gameplay mechanic. I would work on the shooting.
The plot just doesn't make that much sense. I would either just give up on that aspect of the game, or try to do more showing rather than telling. For instance instead of saying "The robots did this and now you have to do this" you might have a little cutscene where the robots steal the heart. Or something like that.