Tip: Bad things to do in the title demo: Enter a door or a pipe, activate a P-switch or a star, complete the level, hit a message block, or die. These will either glitch the music, or force the player into an endlessly looping title level until they reset the game.
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Mario - The Mysterious Gem [Demo Release] [World 8 W.I.P]
Okay, I have to say: good history. It's quite a tale to tell, Mario going to hell as punishment and such. Interesting concept too, as we rarely have a lava hell as the world 1 (everyone use the same overrated grassland theme). The maps... are well-designed, and you did a good choice with the colors. As for the first level... the theme seems okay with the world, so no bad comments about this. The palette seems OK, and the design too.
This level is not finished but I already have an idea ready for the next level, I will use the same gimmick of chocolate island 4, I've saw a few hacks using this gimmick, even though it is interesting.