Technically it can't eat more than one tap/key since that would cause it to close. Sounds like that game grabs the pointer and keyboard and prevents ASUI's blank window from getting it. Same problem happens if a menu is opened when the screen blanks. You should be able to press the escape key inside telescope while the unlocked window is highlighted and it will cause it to close.

I put up a new test binary that will keep the blank window from opening if it can't grab the pointer and keyboard. Lemme know if it works with that game, if not, I'll remove it completely until another way is found.