Hey Suseicat,
So sorry this is happening to you, I've been trying to figure out what can be causing this with no luck. You were able to press space for the tutorial and you can dash so it should be reading the space bar fine. Could you try skipping the tutorial and seeing if you can build? I just want to try and get to the bottom of the problem, I don't think many people get this problem.
Thanks for the feedback and support hopefully I can find and fix this problem as soon as possible,
Rafi