Given the comments on our article about the closed beta, a lot of people are disappointed or nervous about Orcs Must Die!'s trip from cheery, co-op tower defense game to cheery, free-to-play MOBA-like. Deathtrap may satisfy, then. It's being made by Neocore, creators of The Incredible Adventures Of Van Helsing, and it hopes to blend tower defense with action-RPG mechanics. It has co-op and competitive…