I have two good betatesters for ep4 now, but I could still use one or two more. If you want to test it then just ask. I really want to upload this soon and I would prefer to get a reasonable amount of feeback before doing that.

You don't even need to be a good level maker or anything. Being able to tell the difference between a good level and a bad level is enough, and practically anyone can do that.

At this point it looks like all of the tricky stuff is sorted out, so the type of testing needed now is the more general sort (this level is too hard, that level is too dark, etc). If you want to help out, just post here. The first few people to ask will probably get it. You could also try reaching me by private message or IRC query but I often forget to check those.