Tip: When determining a time limit, remember that players won't be as familiar with the level as you are. If you normally complete the level with around 100s left on the timer, others might run out of time on their first try.
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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.