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Hey I have to say, not a bad map. There are just a few suggests I would like to give you.

1) Turn off command block output! It's quite annoying to have the chat be spammed every time you step on a block. You can do this with /gamerule commandBlockOutput false
2) Hide particles of the effects you're giving! you can do this by adding a true at the end of you effect commands like /effect give @a saturation 1 100 true
3) I don't know how you managed this one, but the pressure plate inside the actually level is permanently pressed down so you can't set your spawn there
4) A minecart never spawned so I had to run down to the starting area
5) I would suggest adding names or signs to the armor stands at spawn so I know who is who and who did what.

And of course adding more levels would be great. But as I said before this is actually quite an amazing concept and I had quite a fun time trying to figure out how to get to the bottom before I realized that purple was Instant health lol.