Deathtrap is essentially a Tower Defense game with very strong action-RPG elements, using the battle system and the controls from The Incredible Adventures of Van Helsing series. You can choose your character from the three available classes (Mercenary, Sorceress or Marksman) and you will command your solitary hero through various maps, where you must build and maintain deadly traps to fight the swarms of monsters with the additional help of your character’s weapons and special skills.
The single player campaign offers 13 separate maps that you can all replay on various difficulty settings. You can fight your way through the maps of the whole campaign with the same character, leveling up your hero and gradually upgrading your traps.
If you are tired of the single gameplay, you can always switch to the cooperative mode or try the PvP matches. If you want more challenges, you can always download levels created by other players or you can experiment with your own designs in the Level and Monster Editor, where you can set up your own creatures and maps and share them via the Steam Workshop.