i agree with great sea. get rid of ALL of the locked doors. make the map so when you reach the end of the map your done, not so you have to go back the other way. thatll improve your map ALOT! heres what i mean

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of the tileset, but this is way too long for me. It becomes monotonous very quickly. Maybe take out most of the switches, or make it more open, so the player can take different routes.