Yellow Beam - I agree with what others have said about the yellow beam of light looking out of place and odd. This could be fixed with the beam being made more transparent or trying to create a natural light with shadows instead.
Lava - I see both sides to the lava debate and see you have edited the spawn to try and stop the hot spawning. Perhaps you could make the spawn area slightly larger so if people do fall into the lava, they have a bigger chance of pro running out of there? Thus justifying keeping it as a killable block.
Parkour - I agree with what Ethan said about the corner areas of the map having annoying parkour where you can bang your head, perhaps this can be edited to improve the overall flow of the map?