I can't say it wasn't good...

But it's kinda boring and lacking of sound.

Decent, simple, needs work.

Some additions mostly. Different enemies, maybe make the enemy ships shoot something. Maybe powerups, levelups of some sort, a shield. Something to make the repetitive game not-so-repetitive.

cool man!

i got 129 points and then it got so hard!!

SoulRed12 hit it

SoulRed12 hit every point I was going to:

1. Controls explanation need to be in game.
2. Mouse for shooting and keyboard for movements never works. It needs to be all of one or the other, not both.
3. I got board of shooting the same asteroids and ufos. Make the "enemies" more varied.
4. I suggest that since this is one of those see-how-far-you-can-make-it kind of games, start out slow with only a few enemies and then speed up.

A couple things

It's a great start, but there are a few things you really should address.

1) You need to give controls in-game, though I assume you're going to do that in the final product.
2) Keyboard movement plus mouse shooting is a no-no (unless you have multi-directional shooting)
3) For some reason, when I killed a UFO, it exploded in a completely different location.
4) Make sure to add either an online highscore list or otherwise some way to tell how well you did. If this is going to be a level-based game then it's not so important, but it'd be nice.

Good work with what's here.