Alright, so I got done play-testing and stuff, so I hope this is helpful!

My notes:
-I really like the concept, it's one aspect I kind of wish SMBX had that came from SMW.

-One beef I had with this level was the fact I never knew how much time I had left (besides the 10-second countdown), and due to SMBX's capabilities, I don't really see a way for that to happen. Though I guess it can build suspense/paranoia from the sheer fact you have no idea how much time is left.

-At the end it seemed there was a slight red-koopa spam, I'd mix it up a bit just a tad more.

-I REALLY love the circle/platform graphics, I kind of wish you put some more details for aesthetics.

-Speaking of aesthetics, the Boom-Boom fight room seemed a bit bland, other than that it was fine. Nice use of SMB1 graphics.

-The weird crack graphics seen in the Boom-Boom room (see below) looks a tad ugly. Instead of using 1x1 pixels to draw the cracks, use 2x2 pixels instead. The same goes for the heavenly sequence arrows.

-You can bounce off the koopa as seen in the image to cheat your way around having to bring those mushroom blocks with you.



-The castle sequence kind of ends abruptly, you could probably extend the level a tad longer. Also, 150 seconds seems like way too much at the moment.

-I didn't like the heaven "light" graphic, The light itself should shine down in a cone style (as seen in the image below).



-The extra star wasn't too hard to get.
-The music fit with the level nicely.

-The heaven sequence plus the castle 'destroyed' graphic (when you're outside) were nice touches, haha.

-I died a few times, but that was due to me rushing to beat the level. Once I took my time, the level was fairly easy. I'm not sure where I would place this "world-wise," since I haven't got a clue where difficulty is at the moment.

Hope this is beneficial!

Wow, looks nice! Might test this one out tomorrow

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Hack progress: 6/8 exits
Play the demo right here!

I really enjoyed this level. The concept is good and it is fun to play.
I especially liked the Big Bob-Omb indicating the time limit, and the secret star was creative.

I still have a few suggestions:
- You could lower the amount of time we get, or make the level a bit longer. I always finished the level with around 15-20 seconds left, because you can rush through the second part of the level pretty easy with the cannon.
- I personally liked the Mario Galaxy's Hurry Up Music better than the Final Boss theme, but the Final Boss theme is still a good song for the level.

It's a good level overall. Keep up the good work

Accepted!

Bonus

Due to the nature of the level, I feel this would work best as a bonus stage. It's pretty fun (though it expects the physics to not be so greasy... maybe I need to stop playing with Toad) and it has a lot of neat tricks. Excellent job!