My first 8th Floor game was Day D Time Mayhem. I was so frustrated and furious, but I stuck with it and was soon addicted. This game is very similar, but with different weaponry, as others have described. I really enjoy figuring out how to get three stars on a level. I start with the easy levels and build up my arsenal for the harder levels. I do miss my waddling little dinosaurs that toppled over so cutely.
I have started this game over three times trying to buy a better combination of upgrades. Nothing works. I can't get any farther than Level 15. I hardly ever buy a game anymore due to being out of work, but the demo was fun and I thought it would be worth it. Boy was I wrong.