Ingame glithes and problems

[Yambino]

I've been playing meatboy for a while, and I only have 3 achievements left to get. I decided to stop playing the game for a few months, and when comming back to it, there was suddenly a bunch of glitches.
Meatboy is clipping through the ground on several occasions, and all of the enemies and movements are moving twice as fast. I know that this is so, because on level 5-5X the bridge that collapses behind me is going way to fast to outrun, and it is literally inpossible to make it to the other side.
Before all of these glitches happened, I could beat these levels no prob, but now it is completely blocking my progress of getting the last couple achievements.
If anyone knows any solutions to these problems, please tell me, as I can barely enjoy the game anymore since its practicly impossible to play.

[Big Sagral]

maybe your computer has low memory