y speed decrease 0.5 by every 4 frames.

Over than 1 second faster before I called the CPU. But cost a long time to do that. And that helps me to skip stage 2 and saves much more time.

16 frames lost before boss fight. Due to worse lag avoided.
But saves 19 frames due to better boss fight.

Though I saved about 30 frames a the first plane. But lost them later. Maybe, it's hard for me to reduce lag in this type level.

More lags. Though I got a faster boss fight.

I have to admit that Glitchman is good at reducing lags. I have admiration for him. I saved many lags in stage 1. But lost many more them in stage 4 and stage 5...

ThunderAxe31: Judging.

ThunderAxe31: Due to the existence of a movie that beats level 1 faster, this submission has to be rejected.

ThunderAxe31: Some people brought to my attention the fact that the judgment note I wrote above doesn't explain well the reason of my decision, and I have to admit that it caused some misunderstandings. Mostly was already clarified by Spikestuff and Mothrayas, in the thread for this submission, however I think it should be summarized here.

As HappyLee correctly noted, it's not in the site policy to reject a submission in favor of improvements presented after that the submission has already been made. However, in this case we had an improvement that worked as a proof that pointed out the mistakes made in this submission. Additionally, the author of said improvements, Xipo, also explained some mistakes in a post.

I originally wanted to avoid to directly denote this submission as a faulty improvement attempt, in order avoid being harsh towards the author, as a form of courtesy. But it seems that this only made the situation worse. Now I understand that it was my mistake to purposely write such a short and unclear judgment note, as it was unrespectful towards the hard work of the author. I deeply apologize for the inconvenience.