Right clicking won't work, and the level select cheat are gone, but there's still a lot of ways to cheat.
You can take your mouse off the screen and come back on from a different side, or try dragging your mouse really quickly, (I don't recommend this one, I always get eaten.) or you can open another window to drag over the screen and bring your mouse over it to jump across the screen. There are probably ways I didn't think of too, I didn't consider that people might hold the mouse button down to drag the mouse with them outside the screen, but that seems to be covered by what I did to keep people from playing the game with the wrong resolution to give themselfs an extra border. Or you could change your save data by editing the shared objects, or use a memory scanner like Cheat Engine. Keep in mind that there are drawbacks to each cheating method. The risks depend on how hard you try cheating, (risks range from, dropping a key, to being eaten, to wiping out your savedata (If you want to mess with it make a backup!).)

Just try different things. It'll still be hard no matter how much you cheat but good cheating will make the game considerably easier.
Remember "Cheaters always win!", that's what my dad taught me.

Thanks for the ten this time. I can't remember which is the real key I think it might be the left one. The trick is to move quickly but smoothly so you don't drop the keys. It might help if you know the collision is only detected if you hit the mouse eater's eyes.

Why didn't you cheat past level nine like you did on level five?

Wait for a minute the screen will scroll down. The real door is the one with the shadow going to the right.