I finished your game. First of all, I wouldn't say it looks good. It's not really advanced either. It's a simple, linear adventure point&click game. Those could be good, but this one has some mistakes. I must say I needed a walkthrough to beat your game. From your voice I can tell that you're quite young, so I'd like to give you a few tips, because I think you have potential, but you should learn a bit:
First of all, work on the graphics. These don't have to be excellent, some 8bit themed titles are great to play, but you have to find a style that will look good, and be readable. As a random player I have to be able to easily tell what I see on the screen. And I wasn't sure when I played your game. This also means, you should work on locations. Without the walkthrough, I seriously wouldn't be able to tell if I can look under the bed, or I should click the drainpipe. Sure as hell I wouldn't think of clicking part of the desk, to look behind it. Your scenes have to be more intuitive for player. Try sharing your game with your friends or relatives to test it before publishing. This should give you a hint on what parts of your game are too unreadable.
Lastly, work on your code. Somehow I believe that you might have just taken bunch of scripts from the web, instead of taking a minute to actually get to know what they are. If you aspire to write games, I recommend that you learn C# for reals. Also, there's a bug in your game. At the end. By clicking the gate I can exit despite the fact, that I entered the wrong code.
I hope to see more from you, I would love to see progress in your next game. Cheers.