Yes, I agree. The GB Studio platformer engine does not have coyote time programmed in (you still jump when you hit the jump button a few frames late and run off a ledge a bit). I am trying to get it implemented because it will really help platformer games made with that engine feel better.
I have already fixed the weird "in air" controls. I didnt have time to modify the engine so the player character acted the way I wanted during the 7 day jam but the soon to be released update will feel loads better (I'll be uploading that in a week once voting ends).
Thanks for your feedback!