Hello,
The game is pretty Fun to Play and quite well portrayed. Just love the aesthetics of the Game, Well Done!
The Sketchy approach taken as the visuals is a good option as it's playing the role of an attention grabber. Some small changes are required in this game to maintain the flow and bump up the feel of the game.
1. The Shooter should lose its Arrow if the User shoots, which will give good feedback of no ammo anymore and you are having just one chance.
2. The physics acting seems to be weird and that might be due to the collider you are using for the Arrow Triangle. This is because practically if a User set an angle for the projectile and bounce, he expects to get the same as a result, which is unfortunately not happening here. This ruins up the feel of the overall game.
3. How about destroying yourself if the Triangle hits the Shooter itself?
4. How about adding some pool Particle Effects, some small Animations and other UX related stuff to bump up the feel of this game.
It has the potential to become a Good Game with retention ahead if it's done and polished well.