Glad you like the game.
I'd heard about issues with the backspace key before, but I hadn't heard about the space bar. I think what I'll do is experiment with stopping propagation of those keys to the window. In an earlier build, I was just doing a blanket block, and that was causing other problems (not the least of which being that it blocks popping up a debug window!), but I think if I do a more nuanced selection of keys, I can get around those problems.
I'll try to get a build up today that addresses this. Thanks for playing and taking the time to give feedback!
Edit - Okay, I just uploaded a build that should block space and backspace events. Try it out and let me know if it fixes that issue.