Thanks for the comments everyone :)
I am going to make a sequel, but i'm not sure whether i'll make it next, or make another game first (I have an irresistible urge to make a mouse-maze type of game, but i know there are alot of boring games like that already. Therefore i spent a while brainstorming ideas to make it alot better)
Also, to those people saying the story line is very similar/the same as portal, I haven't ever actually player that game. And as for that Hitman game, i'm not sure if i've even heard of it before...
I think it's just one of those story-lines that get used by everyone. I have the story planned out, but i haven't played the games mentioned so i don't know whether it's similair or not.
But yeah, thanks for the comments everyone! I was worried i was gonna completely screw up my first attempt at a game, lol. XD