It happens when you are pressing space and up at the same time and then try to move left. There is nothing really to show other than that it doesn't move. I tried the game again, this time letting go of the up button once I jumped and it was a great game!
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I'm glad you could figure something out... What sort of keyboard are you playing on? And do you usually have problems in games that require holding down 3 buttons. Cause I believe some keyboards limit the amount of buttons it can return at a time. It could be a hardware issue more than anything. Which would be why I never came across it.