Thank you, especially for your criticism :>
I couldn't use W for jumping since you aim up with it, even considered it... though in retrospect maybe arrow keys for moving might have been a wiser option.
The glitch, based on your description, most likely happened due to few frame drops. I can't pin point the exact reason for that, since I personally never experienced it... Also thanks form reminding that i forgot to add the restart button R to the tutorial... So sorry