hey dude !
excellent job !
the game looks more attractive and addicting now ...

but still much things need to be done ...
first thing is, adding some end game
anything
when you kill all the enemies, timer doesn't stop, nothing happens ...
maybe add some enemy counter that shows current alive enemy number, and add score (or only kill count) that will show after you finish (or die) ...
Add some power ups too that can be used on RMB ...
for example:
-laser sight
-mine
-rocket launcher
-fast movement
-fast bullets
-heal 100% health
make enemies drop power-up boxes randomly and that you can carry only 1 power-up at the same time until you use it with RMB ...
If I come up with few more ideas, ill post them here ...

Cheers
Boris