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[Edit] The rule:
The game must use the trigonometric functions. These include sin, cos, tan, atan2, and others. Remember, only the bold part is the rule, and bending the rules is strongly encouraged.

Oops, I slept through it. Heh, I was afraid I was going to do that. Oh well, I don't code well in the morning anyways.

I made something... playable.

well, i finished a so-so game. it plays, but there is one glitch with the collision detection in the first version.

[EDIT]
Strangely, I can't compile anything using <windows.h>. I need windows binaries.

Kikaru: Nice game! Looks well done and has a decent menu.

Victor: The enemies seem to hit me without hitting me, but other than that it is pretty cool.

Simon: Really nice graphics!

Kibiz0r: Is there a way to win or lose?

That's my ranking.

Well, I can't judge anything yet, because I need Windows binaries.

@CGamesPlay:

Being hitted by the enemies without being hitting or hitting them without hitting is caused by x*x+y+y which should be x*x+y*y.

The revised version fixed that.

@Kikaru: Which errors?

And why exactly do you need "windows.h"? I can honestly say I've never once included it in any of the projects I've written to work on wondows.

My game is very similar to Kibiz0r's and Kikaru's games.

Simon Parzer: Your game could be great. Too bad that is too unfinished and unplayable. Nice graphics though.

CGamesPlay: Your game is interessing, very good idea. But that colorfullness hurt my eyes (and is gay too).

My score:
1. Kikaru
2. CGamesPlay
3. Kibiz0r
4. Simon Parzer

[Edit]
I was using a C compiler. If you use a C++ compiler, you may get some errors. The return in line 250 is because main returns int and the return statement returns nothing. Put "return 0;" there. About the conversions, i think that could be this:

dx = tiro<i>.x - inimigo[j].x;
dy = tiro<i>.y - inimigo[j].y;

Where i'm converting float to int without a cast. Just cast to int and it will be ok.

By the way, the C compiler don't even warn about that, where C++ could give errors.
By the way I should remember to use -Wall and -Wextra to avoid this.

Binaries here.

[Edit] As I have some SVN version of Allegro 4.3 from somewhere in time. I putted that there too. JUST FOR TESTING PURPOSES. DON'T USE THAT DLL FOR ANYTHING ELSE.

So, after dinner I thought I could finish my little game. Took me more than one hour, but anyways.
The revised source can be found on the MinorHack page, and it is attached to this post.

I cannot provide a Windows binary, because I haven't yet had the time to set up Allegro under Windows.

EDIT:
Here's my rating
1. Kikaru - Great idea, nice "radar explosion" effect. Not very challenging, though.
2. CGamesPlay - Beautiful colors, but not very playable.
3. Victor Williams Stafusa da Silva: You should have limited the bullet count.
4. Kibiz0r: Nice gravity physics, but I don't have a mouse cursor and the player is not able to die.