While it is an enjoyable game, Superfrog lacks the flowing level designs of platform games at the time, such as Mario and Sonic. It may have been great for a kid in the early 90's who didn't own a console, but there's nothing special about it to warrant the praise it has received over the years.
Although it's rather pointless to review a free game, most would be lead to that a game like this is not worth his/her time. This was not the case with Teen agent, and despite a few nonsensical puzzles, I enjoyed the game purely for it's good writing and great animation.