Looks great! I can't wait. Gimme a link when you (qoute here) is done with it!
Fix that background.
Pick a light pleasing colour scheme.
Make a shop for buying new arrows like chicks and whales (ask @SmilingSnowflakes for these! She will make epic ones!).
Epic graphics effects.
Solid feeling gameplay, this makes the whole game better.
Ease the players into mechanics in a non-threatening way.
Put some form of copy proofer on, like the AHCP 9000 (A Happy Copy-Proofer 9000)
Well I got more!
Better start screen.
Actual windows for the How to Play.
Make the whole game very solid feeling, Super Mario Bros does this very well, when you jump on the Goomba it feels solid, strong. Like throwing an egg and hearing that Crack!
You has your ideas! That is a long check list! (Bear in mind that I hardly do a lot of this stuff myself )