When you play this game, make sure you move around.  As you might expect, enemies will have a hard time hitting you if you don't stand still.

Isn't it satisfying as well to see a robot explode?

This looks realy cool. Well done!

Looks amazing. And the grays will be more consistent on a real calc, right (instead of jumping between three shades in the screenshot)?

I mean some pixels in the screenshot seem to jump from gray to black periodically.

EDIT: Might be from moving around. Never mind!

The greenish screen is like the real calc

I noticed that too. Maybe they should be more generic.
Also, the gun looks fake. Either have it look like it is coming from the corner of your eye or do it doom style.

I'm not sure if there's anything you can do about this, but the sprites are really blocky and I can't tell that enemies are enemies. They're just... blobs of pixels. Is this for performance reasons?

Ah yes, blocky sprites.  There are many reasons for this:

1. This is based on the gemini engine, which did the same thing
2. To make objects and enemies easier to notice, I double-thickened or quadruple-thickened most of the lines
3. With raycasting on such a small screen, it's easy for the calculator to overlook certain pixels
4. Yes, performance
5. As long as I have fun working on this game, it will get done.  If I work hard and do research to try and fix this issue, it's going to kill me and make me get bored.  I'm hoping, though, that it won't turn you guys off 0_0

EDIT: I did try making distant objects bigger, but it didn't work out    ENDEDIT

As for enemies being enemies, you can tell what an enemy is by looking for a circular "fireball."  I also added the fireball to make it easy to tell an enemy that's too far away

Also, the gun looks fake. Either have it look like it is coming from the corner of your eye or do it doom style.

I'm always open to criticism or suggestions, negative or positive, but please don't order me to do something with my game.  Even if you didn't mean it that way, it sure sounded like it.  With that said, even though I respect your opinion, I like the guns the way they are.