Thank you very much for trying out our game! good chatch on the bug, its just a small oversight, so we will have it fixed by the next update! Also could you elaborate more on why you want the dash cancel window more narrower?
Is it that you don't get your dash cancel to come out? or is it that you aren't able to connect an attack afterwards?
One thing to note is that you can't use the A+B dash macro for dash cancels. so you'll have to do a ->-> or <-<- input for dash canceling.
Other then that, you are able to buffer the dash input during hitstop so you can do it a lot earlier then you might expect.