Not an original game, but a good one.
I'm a fan of defense games like this one, and I have been since my days of playing StarCraft. The gameplay is just above average, topping various other defense games found on the Portal, but it's still nothing new. I haven't played many defense games set in the past, so I enjoyed that. As for the graphics, they were nice. I didn't feel an overwhelming sense of artistic vision on this one, as the monsters seemed somewhat bland, but it didn't take away from the gameplay, so I was fine with it. The menus and such were well done, I did notice that. The colors worked well, in my opinion, though the scheme may have worked better if the whole game had been given a slight graphics tweaking. I'd suggest considering a graphics overhaul if you ever consider another defense game, but that's just my opinion. The sound was alright, I didn't have any problems with that aspect of the game. I enjoyed it, but I wasn't in love with it. A bit more effort into the sound may have made me a bit more fond of it, but that's not the most important thing in the world (though for me, it can be kind of a nuisance if the sound is terrible).
Overall:
Good gameplay, not fantastic, but I'll end up playing it for some time.
Sound was decent, didn't cause me to lose interest.
The graphics are just good enough to keep me playing.
All in all, you got a good game here. I hope to see more from you.
-Psionic-