Here's my review: (even though I'm not a judge)
The level looked pretty nice, and it actually made me feel like I was playing a mountain/cave level. It was a clever to make it so the player has to climb the mountain and get to the top (or rather the pipe at the top to access the cave portion). The boss was pretty interesting too since you had to beat him before the floor blew up. However, the difficulty level was kaizo, not to mention the npc spam in multiple areas and the graphics clash in the cave section. There were plenty of tricky jumps too.
Design: 5/10
The level had plenty of flaws such as the spring action precision jumping while avoiding a lakitu dropping piranha plants.
The climbing section was also kind of misleading because when I played your level, I tried to climb to the top of the screen and then I hit the top and then I died from the obstacles falling. Also this looked kinda strange to me:
The overlapping pipe also looked kinda strange:
NPC Placement: 2/10
Some NPCs were placed in clever areas; however, most of the level consisted of NPC spam:
Atmosphere: 7/10
This level did indeed feel like a mountain/cave level due to the climbing aspect of it. My only issues are the NSMB bg and SMW custom tileset in the cave section, and certain sections of the level were kind of flat.
Music: 5/10
The music choice was awesome and it really fit the theme, the reason why I give it a 5 though is because the custom music didn't seem to work while I was playing the level, so basically the only time I heard music was at the boss fight. (I did listen to the .mp3 files though)
Overall score: 4.75/10 Level needs a lot of work. just fix the the things that I mentioned and your level will be fine

(Not official since I am not a judge)