I decided to delete my old review, leaving a part of it that relates to the thing that still has not been addressed or fixed, to make it leave you a fresh notification. But there is much more important thing that needs to be addressed.
It's about the lag. You've got a massive MEMORY LEAK in your game that is causing the lag. How do I know that? After passing several caves the plugin container of my Firefox was already storing some 1-1,5 GB of data! After few minutes of struggle to close the browser not only the Firefox stopped responding, but your game even made my computer barely working. You HAVE to fix this because otherwise your game is simply dangerous to computers and can DAMAGE them! If you can't seek for help from the community and if you still will not be able to do it - remove the game.
Old part of the thing that has not been fixed: The game looks interesting and has its mood, but unfortunately has some flaws. And probably all of them are related to controls that are not as responsive as they should be. The jumping mechanics is problematic. And very often when you run down a \ type slope the character fails to jump. The same happens when you press up and right/left at the same time: the character will move left/right but will not jump.
I noticed that it has been pointed out by several users, but you did nothing about it.