Way too long. Needs to cut down in certain places like in the first part because it feels like a drag getting through some levels. It seems like you got more bogged down in trying to capture the scale of these places from Dune (I haven't actually read or watched it so this is just what I'm assuming), I would recommend play testing some more before publishing in order to make sure that it's not too long. I would tweak the special infected spawn rate as well if I were you, because in the first and second parts of the map I was getting at least 2 specials per 5 minutes. Other parts I thought didn't have enough specials such as the archways in Part 3, where there could've been a nice opportunity to have an increased charger/jockey spawn rate which I felt would've made that section much more challenging rather than just something to look at.

Custom weapon is pretty cool, but the random inspect animation that plays is distracting rather than helpful. Music is a nice thought but it becomes irritating fast since you also replaced the tank + horde themes that play so instead of it adding to the experience, it makes events like mentioned above more confusing than intense.

Also why use Dust2 for the third level? I get you were testing stuff out but it just seems sort of lazy to not change it from T Spawn and A Long.

Overall, eh. Not great. 3/10.