Thanks!
The level is about 95% done and completely playable (which means I already placed every collectible item and all areas should be reachable without cheating). The only things that are still missing are the intro cutscene and a bunch of screens for the very last bonus area. I was planning on finishing all these things this weekend, but then I got sick and had to spend two days in bed. So... poop
Still, I'm confident I can get this done in the next few days, since I'm feeling a lot better now.
Also, I feel it's time for some testing and external feedback. I already have a volunteer, but if someone else wants to be a tester too, that'd be great. It's always useful to have multiple opinions on the same matter. If you're interested, just post here or PM me. Edit: Got enough testers for now. Thanks for the quick responses!