If by first level you mean the blue level, I would change the floors to have more holes in them, like broken ice. Also I would help direct the player more, since it's a bit too much of a labyrinth at the moment and can be frustrating to play.
Ohhh, I was referring to the floating red platforms and lake of blood level... is that not the first level? It's been a minute since I last played.
Ah no, you're correct. I just usually referred the floating red platforms level as "Level 0."