welcome this is my first guide but it’s easy don’t worry. and no i am not new, it’s your friendly, Neighborhood, spydecraft.
so first, get a button, get an item granter so it grants you a red seed and a blue seed. then get a button and a checker that checks for the seeds, then make it so it opens a barrier and for decoration add a plate with the color of the seed under the player. get a counter that if you use each hand in a plate two times, it opens a barrier.
but you did fix the door glitch it was open just enough for you to fit in and then the game would shove you the rest of the way through and once on the other side you cant get back in