UltimateMadness hmm..
Well I like it, and it does pick up later on. Though after level 7, started 8, then just went to 9. Then at 9 there wasn't anything there, waited a little, 1 super man came in, killed it. Waited a bit longer, another super man came in, killed it..waited alittle longer.
By that time I was bored so I just right click>play> So game over for me. Still I think there may be a bug somewhere in that you should look into.