I'd suggest giving us a beta and letting us give you some feedback on that before releasing it. It's hard to say much useful from just a couple screenshots.
But I'll try anyway. Hard to tell without seeing it in action, but all those glowing sprites might get annoying. Also, the textures don't look very... textured..?
Btw, if you are making textures for HL you should keep them in dimensions that are powers of two- 16, 32, 64, 128, 256. While you can use anything that is divisible by 16 (eg 80, 112), textures that size get sampled down to the next lowest power of two and look crappy. ie a 112x64 texture will get sampled down to 64x64 quality, then blown back up, and thus look blurrier that it should. Best to size the uneven dimension up or down.
regarding soundtracks: if it's a huge wav file of some stupid Korn song I'll rip your lungs out. no, really. I'm so sick of downloading a 12mb zip, of which 11mb is some s**tty 'nu-metal' band and of which 1mb is a horrible killbox. There will be no more mercy!