Thanks for the feedback Proxima, and great timing too - I just got back to working on my levels again (and even built some new ones, see below
).
13: Took me a while to figure out what you did here (your description misses some important steps at the start), but I think I see it now. I might use a climber to make absolutely sure only one lix can get out from the left side.
16: I thought this one was fairly demanding execution-wise, which is why it's quite far down the list even though the concept is simple.
19: I like that solution, it's very different to anything I though of myself. There's heaps of ways to do it (my usual method is to use both cubers at the start), that's really the point of this level.
As for 23, I decided to put the two 'tribute' levels at the end since they are of a different style, not sure what to do with these really.
Attached are two fairly simple fling levels, Coming Unstuck and Another Trick in the Wall. The title for the latter may not be final, since the 'Wall' reference is a bit cliche
. I shared another level on the IRC a while ago too, but I'm not quite satisfied with it yet.