Well I finally got around to trying this level (emphasis on "trying") because I honestly couldn't finish it. It's not that the level is overly difficult, it's that as I progress through the level, the game begins to lag more and more until...
I reach this point and the lag becomes so unbearable that I cannot progress.
I've tried restarting SMBX and my computer thinking they were just acting up, but the lag happened again and again. Just to be 100% sure, I played a level I previously tested. No lag there either. At this point I assumed something in your level is causing this, and it makes your level unplayable beyond a certain point.
Is this lag-fest happening with anyone else? Would be good to know whether or not this is just happening to me.
I'll at least review as much as I completed before lag city attacked.
The music and graphics are good, and the level design seemed good. I found the lava lotuses to be a little annoying. Through what I've read in your previous posts, the concept sounds good, but I know the it doesn't begin until after the midpoint (which is after the start of lag town), so I don't know how well it works as of yet.
Here I knew that the platform and spikes (circled in red) would fall because I observed it fall before running in there, however...
I ran right into this area (also marked with the greatest red circle you'll ever see) not thinking anything would happen and got a nice little surprise known as death when those spikes fell.
I'm not saying get rid of them all together, but maybe there should be some difference between the moving and non-moving spikes.
...or maybe I'm an idiot for not guessing those would've fallen on me... :/
Anyway, I really hope this lag issue is just happening to me because it sucks to have a level fail because of unbearable lag.