Puzzle Agent is currently the only Telltale game that's quite like Puzzle Agent. Telltale's other games are fun, but in a different way. If you want to see what they're like without spending any money, check out Sam & Max episode 104, which is free to download. If you like that, grab the rest of the Sam & Max seasons while the sale is still on!
Telltale hasn't yet announced if they'll be making any other Puzzle-Agent-like games or not.