I really enjoyed your map! I thought you did a lot of stuff well:
1) It started off easy and progressively became harder. It wasn't a complete slope, as some parts were easier later on, but it kept me on my toes.
2) I really like the amount of variety, I never knew what to expect. Also those jumppads that send you all over the place were really well coordinated and done! I also really liked the rainbow bridge and the waterfall hallways.
Suggestions:
1) Does it have an ending? I might have forgotten to put it in SP but when I reached the end I wasn't 100% sure it was really the end. Also are you aware of how to change from one map to the next through triggers? Check out the mapchange map and mapchange.cfg , just in case you ever do any sequels

2) At one point in the level you allow the player to walk around the walls and see everything below. I wasn't quite sure where to go for a bit, which I personally don't mind too much, but some people get upset when they are unsure. This is directly before you jump down to where that lava is.
Overall great job, I really love the atmosphere you've created. Take care and keep up the good work!
-mike