Holy shit this is your first map? Nice polyobject usage! I feel like you could have experimented more with train gimmicks, the enemy rooms are kinda basic and boring, the top of the train was absolutely frustrating, but the golden speed shoes are extremely creative, I love the idea there.
I think it's a shame you didn't submit this to OLDC. You still would've had a month to polish out some of its kinks, plus you kinda get a guarantee that the majority of the community will play your stage and leave constructive feedback. I think this definitely would've placed high. (Also I'm not getting the software errors you're referring to, ????)
I think the biggest change you could make for an update to this is to rework the part where you run on top of the train. Right now it's really slow and precise, it's WAY too easy to get bullshitted backwards or hit the spikes accidentally. I know it's not realistic but gameplay wise it'd be far more fun if you toned down the wind just on the roof of the train, and spaced the spikes out more (maybe you could use another enemy, like Egg Guards.)
Anywho, I can't wait to see what your future maps look like if this is your FIRST (again, holy shit). Or what future updates to this stage look liked. Great job!