These must make sense to you but you have to remember that when making a game you should think from the perspective of the gamer so that you can see how difficult these passwords are to guess (The shoddy artwork makes it even harder). 1/5 needs serious work.
Sorry to say but the game has massiave room for improvement. For example you could make the ships to that their dark backgrounds don't obscure the grid background; you could add an upgrade system. But I really like the originality of the game please do a sequel.
I agree with Maglor it is a fairly enjoyable game but, for me, it is too simple. It needs to have a way of earning points and buying upgrades as the levels get harder. But as it has no upgrade system or progression in the game 3/5.
You need to extend the game a lot more. Like adding in an upgrade menu, having different modes of play and having an actual storyline that progresses as you play.
There are lots of glitches with the badges that need to be addressed asap. 4/5 great game to play but too short and has a fairly limited upgrade system.
Ok game, but it really needs an actual upgrade system and a clock so thet you know how long it has been; and you need to fix or replace the turrets so that they help you, not kill you.