There's not really an awful lot of strategy to this game. It's just a matter of place a factory of your choice and then fully upgrade it as quickly as possible, and then place another factory, etc. etc. using the EMP whenever a robot gets close to your wall (because money gained from kills > cost of EMP in that situation).
If you're going to make waves difficult, at least give the player the opportunity to keep whatever particles they got before they died and upgrade before they try again. Right now, beyond wave 9 it's pure luck as to whether the enemies spawn in the right sequence, as any more than two missile launchers or one missile launcher and one level 3 thunder ball is impossible to deal with.
If you press Space while the game loads a track, it loads the track and treats the game as paused, and then when you unpause the game, you can't do anything.
Wow, this game is seriously hard, but it's seriously hard in the right bits. I wasn't so keen on the levels where there was such a lot between two "safe spots" - that's what I call areas where you can stand all day and not get hurt.
I managed to infect a shielded ship. It's good for hitting targets above and below you, but crap at shooting at stuff directly in front of you and it's sluggish as hell. Best ship imo is the first one that actually attacks you, since it shoots at the stuff directly in front (which any ship should really), is fairly nippy and can take a hit or two.
Keys are unresponsive so no amount of bashing the down arrow key gets the helicopter down once I've bitten it. Am I supposed to time my presses or something?