Glad you let this one escape into the wild! Nice small-to-mid maps that get more interesting, challenging, and weird as you go along.
FWIW, on skill 2 I ended up running low on nail/shells at some points which forced me into some creative GL usage, and that's some good fun (as long as it all works out in the end).
Obviously the texturing/detail is kinda throwback... not too surprising for something started in 2003! It's well done tho. I enjoyed the bit of nostalgia, and also I've got a soft spot for Zer stuff.