This game just keeps coming back. Will it ever actually hit the fan? What is 'It'? Will the main characters ever do leg day?
Anyway, other than the new content the game still seems to have the same fundamental problems from around dd9 (and I imagine around dd2 and 3 too); the gameplay loop of serious sam + smash tv - level/enemy design just isn't fun, and there's tons of technical problems ranging from controllers buttons being bound to both accept and back, a second player spawning with reverse controls in single player (if this is intentional it's the most confusing thing ever), to the game refusing to let it's self be close by anything less than task manager.
To be completely frank, this project has been spinning it's wheels for far too long, it either needs a huge overhaul or scrapped. Continuing with this without some serious re-tooling would just lead to the game being nothing more than a .99 cent trading card vehicle.