Good start and good job having a youtuber play your game, however you should wait till you fix various issues before exposing your video game.
Some suggestions would be:
1: Block off dead ends on the map so the player doesn't see the map as a floating building.
2: Use fillers such as boxes, chairs, tables, so the levels feel more realistic and give the player a reason to explore areas in more detail.
3: CHANGE ENEMY SCRIPTS.... that way they are not the worlds worst gunmen, this will add challenge and can even be used for enemies to shoot from far as the youtuber suggests in his video.
4: Start a story/objective so the player has a goal in mind and is not wandering around till suddenly he advances to the next level for what seems like no reason.
This should get your game going in the right direction, keep up the work.
As always, Game on! -2S!K Productions