Thanks for the comments! As, it seems, with all of my levels, this was originally going to be much longer, but it got scaled back; I'd rather release a short and concise level than something long and rambling. My next level will definitely be larger methinks. As for the graphics: Yeah, I admit they're quite bland. I'm not very good at tilesets, especially organic stuff, so I make my levels intentionally indoors and mostly metallic. Again, I'll try to overcome this for my next level.
The stairs: I found them quite easy; several people report finding them very hard. I'm not really sure what to do about this... I'll probably make them somewhat easier if I release a second version, but I won't make a second version for that alone.
Thanks for the feedback