Unfortunately it's hard to balance the game. Now the difficulty of game depends on your browser and performance of your computer. For example it's easy to play in Firefox but little bit harder in Chrome. If you'll try to play this game from old PC you will not be able to pass the game at all. This is annoying and do not allow me to balance the game. I don't know how to fix that for now. More info on this here. Hope to fix it in future.