It was very unstable indeed! I couldn't exit, but it was interesting nonetheless. It was a bit choppy on my end so looking forward for an executable after the jam!
When you jump while holding ctrl, the game crashes.
That's very interesting, what do you mean the game crashes? Does the window just close?
If you were pressing "CTRL + Space" then pressed "W" at the same time, the CTRL + W is registered by windows built-in-short cut and closes the browser.