JaiSh, i used a few sheilds and made it to where a nullifier was built in the cage, then destroyed the creeper. Also, Add on to him, you may want to add on about 10 blasters to get through faster. it's a hardy investment, but worth it.
i like the concept of dimensions (level 8). IT SUCKS TO PLAY THOUGH. it takes too long, you have to make huge infantry to stand a chance, and everything must be a reactor or tech dome otherwise. but an overall good game! :)