The level
Atmospheres2 is impossible to finish, I got up to about the 2700 level, and reached a dead end. Which pissed me off because I had to go up for like 40 MINUTES just to come to a glorified crystal thing
~1.7 MILLION ticks of Y up. Ugh.
Your warp star from World 11 leads to not being able to go anywhere. Seriously!
Also 17 worlds is too many. The Mario games never had more than nine (originally).
Super Mario Bros. 1 had eight.
The original Super Mario Bros. 2 had nine, was upgraded to thirteen on the SNES.
The US-released Super Mario 2 had seven.
Super Mario Bros. 3 had nine, eight if you don't count the Warp Zone.
Super Mario World had nine.
Super Mario World 2 Yoshi's Island had six.
Super Mario 64 had 15 main levels, but only four sections that could be considered worlds.
Super Mario Sunshine had eight sections.
New Super Mario Bros. DS had eight worlds.
Super Mario Galaxy had nine sections (ten if you count the extremely small beginning one)
New Super Mario Bros. Wii had nine worlds.
And Super Mario Galaxy 2 has seven worlds.
Notice that they all had from six to nine sections/worlds, except for Super Mario 64 (only four), the re-released Super Mario Bros. 2 (as Lost Levels) and arguably Super Mario Galaxy 1. You have seventeen that are all over the place most of the time. It's even hard to tell what world a level is in, quite often!
As for the number of stars needed to enter certain areas, if you don't have enough, you can only exit the level by dying.
You don't even have to beat the bosses to beat the x-4 levels. Also, the second download seems to be the same as the first one :(
is what I give this at this time. The game is just so hit or miss right now.