This is the map, everyone. (linked, not sure how to thumb images...)
I don't know anyone who'd want to DM in this. There's only one spawn point per team, the skybox is literally the ceiling (guess where it is), and the only thing breaking up the flat ground are the lights (that apparently don't work the right way, because the light they cast is on the wall behind them... I guess). There's small health and ammo to make camping really easy (on a DM map of all things!) and on one side they're a lot higher off the ground than the other. Also the wall on the RED side has a crack in it.
Do you know what MGE is? Head on to an MGE server for a while and examine the map. It's made up of smaller segments from maps commonly played in competitive because they're common places you DM in. There's geometry. There's features. There's literally anything that isn't flat ground with lights and some health and ammo. It's fun to DM on. Hell, don't even bother with MGE, go look at DM_store - yeah,
DM_store. DM maps should be fun for every class to run around in and kill shit. This map doesn't do that.
And no, "it's my first map" isn't an excuse for being mediocre. You literally -
literally - took a box and put stuff in it. Come on, dude.