Developing a new game

So I am looking at creating a new html 5 game. Usually I just program the game myself but to speed up the process, I am not looking at using a game library(crafty.js).

The main idea of the game is a tower defense game based on fantasy  The twist is that you play a fantasy class and you can add to the defense by attacking minions. Not sure how many stages it will have yet. 

Another thing I would like to implement is multiplayer. Having a mix of different class adds a lot to the game play when multiplayer is involved but i'll cross that bridge when I come to it. Post more here when I have developed more.