Congratulations on your first game!
Let there be many more to come :D
If you want to experiment with adding audio to the game, check out these sites:http://www.anticulture.net/MusicGenerators.php
Creates a random midi song each time you click a link. Convert to mp3, and you're good to go :)
Pretty hilarious results most of the time, but the Random Trance Music Generator might make some tracks that combined with your game will give you that good old 1990's nostalgia feeling :D
PS: the Hip Hop Beat generator for some reason only outputs songs that sound like theme music from some vampire castle in a computer game.http://www.bfxr.net/
Creates random sound effects and lets you tweak their values.
I used this for almost all my sound effects in my latest game: Chroma Cell