Good job :) Though overall, the level is very short and needs to be extended to fit the 2-3 minutes criteria.
For the ODD itself. Avoid handwritten text. It is very hard to read. In general, don't use too many different font sizes. Avoid unnecessary arrows and descriptions. We already know how the player and enemies look from the legend, no need to write it again in the map. Moving pad - what is the line there about? The text can be next to the pad. Instead there should be a clear indication of the path the platform takes. Portal - there is plenty of other ways you can indicate that they are connected besides a giant arrow - colors, numbers, etc. (even nothing, as you only have one portal).
I do like the legend and the descriptions on the side. They could be a bit more organized and take up less space - letting you make the level map bigger and easier to read.
(Also, can the player not just jump over the locked door?)