Thanks all for the constructive feedback!
The game was designed originally as a 4-player online coop but then when I realize that not many people will be able to play the game, I have to adapt it to make it playable in single player. This transition diluted some of the important aspects of the game design that was meant to work well in a multiplayer environment.
You can always try the game in multiplayer mode by launching two or more instances of the game in different browser windows but this is not the same as playing with actual players online :)
Thanks for playing!!