i made my efforts into trying to list them in order xd

1. The Nightmare - By Jax (Easy demon)
2. the lightning road - By timeless real (Easy demon)
3. abcdefghijklmnopqrs - By NeoSweet (Easy demon)
4. VVVVVV - By zejoant (Easy demon)
5. WeoTheory - By WazE (Medium demon) -- MY FIRST MEDIUM DEMON
6. Speed Racer - By ZenthicAlpha (Easy demon)
7. Forsaken City - By LightPotato99 (Easy demon) (Platformer) -- MY FIRST PLATFORMER DEMON
8. Gateway - By vyp (Easy demon) (Platformer)
9. Brainfugd - By Spu7Nix (Easy demon)
10. Platinum Adventure - By Jerry4 (Easy demon)
11. Flipswap Factory - By zejoant (Medium demon) (Platformer) -- MY FIRST PLATFORMER MEDIUM DEMON

Please let me know what other demon should I beat :), that's all, I guess.