Nice Idea 

+ I love retro art style and hard games

This game is cool but controls ar efor me very bad. It will be better if you add better controls and I can again join your game

Simple idea, the art and music is nice.

I got stuck after the second checkpoint, on the right exit there seems to be a deathbox and on the bottom left the game crashed (see below).

The controls seem not very intuitive, I confused which buttons to press several times.

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ERROR in action number 1

of  Step Evento_player for object o_door:

Moving to next room after the last room.

at gml_Object_o_door_Collision_o_player

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gml_Object_o_door_Collision_o_player (line -1)