Speaking of which, being spotted doesn't always spell the end in Serial Cleaner, although cops can run quicker than you and all it takes is a single hit for it to be game over, sending you back to the very start of the level. (wolfsgamingblog.com)
Since most mobs are very tower specific it would be nice to have a little info box at the start of each level telling you what monsters will come so you can prepare, its one of those «you - need - to - die - your - way - thru - the - level - to - know - where - enemies - come - so - you - know - how - to - build» type of TDs. (metacritic.com)
I've been dragged back to the start of a level more times than I can count. (xblafans.com)