The game features 4 unique levels (5 if you count the credit level), however long it may take to beat them. They all are detailed the max that we could in the alloted time that we were given in our class.
There is one bug that we could not fix, it happens in the tranistion from the first level to the second level, on the second level. You will sometimes end up getting stuck in the walls of the drop pod. There is no escape if it happens =/, the only fix we found it to restart, but you won't lose much progress if you do, not much happens in level 1 -> 2. The easiest way we found to avoid this bug, was to stand still in the center of the drop pod while it goes down.
We also retextured most models that we used to help provide variety from the original Half-Life. We also used textures from other mods called, "Natural-Selection" and "Brainbread". We take no credit in the textures used made by them. We also used a song from Scatman John (We miss him dearly), all we did was slow it down. All rights are his.