The platform is intentional as it is a shutter/gate , if you look in the game description on the game page or in the how to play section of the game it mentions this. This is in the game because it gives reason to make the player rush instead of just having a timer and crying on the floor when it runs out . As to the player it would seem as 'why can't i just walk over there and exit, why is there a timer?' , hope this clears it up.
Could you show me where the stuck on surface bug happened through screenshots please, so i can patch them out after the jam? :)