A sequel to the first Island, again, a tropical forest, but this time with a much larger indoor area. Plus it runs faster.
id software those whos textures and sounds I used (see note)
New from scratch
A few months
Deepsea, Paint, Wally, DoomBuilder
There is a couple, I don't know how to fix one, and the other requires special circumstances. (You can see above and below a fake floor at the same time, which causes a visual error, but does not effect gameplay.)