That's some _terrible_ weapons advice. Aside from that I hope splitting games in this way and clotting up the guides section doesn't become a trend, it feels cheap to say the least.
Better version; get ricochet or arc spread or both for the short term then both then get energy missiles then skip all the way to big laser then get time slow, rail gun and the melee distance thing at about 150k. You might also want lightning.
Like the first, the length of the game far outstrips the amount of time you can repeat essentially identical levels without peak... and yet it doesn't get significantly harder. Bit of a wasted opportunity to improve on the first in any real way.
The slippery slope of linking xp to performance in levels is superfluous, also don't like the ammo pickup mechanism on drops from enemies. More seriously though is the zoom forcing you to play mostly from the minimap, which isn't colour coded for different enemy types and wastes 90% of the screen.
And the default position in a game like this in terms of firing should be whatever you want to do most - i.e. default to fire on, hold mouse to not fire or lmb toggles firing on/off.
Rather easy, could have borrowed a bit more heavily from everyday shooter (I believe that's the main inspiration, no?). Needs API, another enemy type, an ending! Other than congratulations... now start again but with a ridiculous amount of lives. A solid base to work on for a great game though, smooth and bugless despite high activity.
'You have another web page... emitting sound... close [it].' no shit, maybe I'm planning on getting these trivial badges while listening to music I go out of the way to listen to? Damn this game is overrated.