It's plain. Missing a lot of things.
I got 81k but no highscores list to brag about it? That's sad.
The engine is promising. You could build around it. Have a story or something.
The wind doesn't seem to do anything (that was wind in the top right corner, isnt?)
The time bonus is so small (if there is any) that it is not an incentive.
So in summary, this is a nice engine that makes you shoot arrows but it barely qualifies as games.