Update v1.9.4.0 - Checkpoint system + Difficulty Balanced!

Hey guys, so I've been listening to the feedback, and I'm trying really hard to improve the game and make it as good and fair as possible. Therefore, I've created a checkpoint system that allows you to place a checkpoint anywhere you want. Hopefully, this will make the game more accessible and give you a better chance of beating it.

You can obtain a checkpoint by collecting a white heart or by falling off a level, but there is only one available in each area. Therefore, you have to use it strategically, and you can place it anywhere you want or save it for the next level. However, if you choose to save it for the next level, that level won't have either black or white hearts.

More balance changes: • Fall damage has been removed. • NoRoY can now withstand one additional hit from saws. • The confusing mechanic of broken saws has been removed. • The damage inflicted by rotating lasers has been reduced. • A bug has been fixed where the third jump sometimes failed to work after a wall jump.

I had to make a lot of changes to the code in this update, so hopefully, I didn't break anything. However, if you come across any bugs or issues, please let me know so that I can fix them right away.