Thanks - makes me happy to hear you like my game.
I am really sorry, that you have such bad experience with lags.
The video I uploaded in the previous comment is from the update I will upload after the rating is over. I noticed lags as well in the browser version - but it was too late to fixed before submission ended. In the current version the entire map gets loaded and is active even the stuff the player doesn't see. The Windows version can handle the large amount of objects better. In the coming update I load and unload stuff dynamically and let you run the game at solid 60 frames.
You can try to download the Windows version - it should run with better performance, hopefully.