This is my first mario test and first map submitted. There are a few bugs which will be fixed in v2. Its pretty short. If you fall you go back to the start. I will add item boxes in v2 and other than that, its up to you! Good luck! And, yes, i know, its backwards.
Pros: 2d mario style including finish
Cons: The map looks very bad (fullbright, background isnt changed so the bottom sqaure shows up which should be hidden and barely diffirences in textures).
Improvements: Change the background and add light. it could improve the map alot. and where is the finish flag you can jump on? also, make it have more routes (all in 2d style). more routes make a map worth alot more and make a teleport to the start
Notes: Add the flag and item boxes (most likely will be best made by creating a box with a trigger_multiple below it which has an entity spawner. 7/10 :)