I like the bullet jumping idea, good job!
For the one page design document itself, it feels rather overcrowded and hard to read. Try to use less text and more pictures for the legends. Levers and gates that are connected can be color coded for example to make it clear they are connected. Then you only need to place a legend with the symbol of the lever and the word "lever" etc. Dotted lines, what do they mean? This should be mentioned. Same goes for the optional bullet spots (what does this dot mean). The path of the enemies, why do you mark it differently each time? And again, what do those dotted lines mean.
Also how much health does the player and enemies have? Can the player kill the enemies with the special bullets? Can they use melee attacks? "Simple walking enemies" - does this mean they only walk and not attack? What attack do they use?