A fun alien bashing mod. It is simplistic but never boring with enough changes to each level to make each one unique and interesting.
I love when there is a thick fog in the level, which makes shooting at distant targets difficult.
A few levels are easier than others while a few are difficult and clever in their approach. A good mix.
The only downside is that, at the end of some of the levels, you are taken back to an earlier level that you already played than to the next sequential level (example, upon completing level 200 you find yourself transported back to level 23). Level 23 is also the only level where Trump's floating head is not used in place of the juggernaut -- perhaps this is an image tagging issue.