I wasn't expecting anything much from a free game, especially not one that doesn't have English voice acting. So, Teenagent is somewhat of a surprise. The game's very difficult, and at times the puzzles are nonsensical, as some users here have stated. I had to check out the walkthrough a few times to understand how to proceed - and this is coming from an adventure fan
Nevertheless, the game's storyline is hilarious, and although it can't be taken seriously, it's still very fun and enjoyable. The puns and dialogs are also worth playing the game for, and if you have the patience, you will definitely be rewarded from some very well-written lines. There are typos here and there, but for the most part, the dialog is very good
Note that I do not take the price into consideration. Considering it's free, I'd give it 5 stars, but because I rate this game based on its merits and not price, it gets a 4-star rating from me. Very difficult, sometimes frustrating, but that's what walkthroughs are for. Ignore the flaws of the game, and you'll have a fun time