Thank you for the comment!
The rewind was actually supposed to teleport you to the point, and the point wouldn't modify its position, but we used this mechanic instead because it made up to more and easier to create levels (since we had only 1 day left to create and introduce the levels).
And for the bullets that moved too fast, and killed you when they shouldn't, it was a bug (not really a bug, but a miscalculation from my part). Sadly I lost the project a few days after we submitted the game due to a files corruption.