Finally a game that is all about graphics! Reminds us that before we had the ability to see 3D images moving in real time, there was some fascination in just matching images and playing with color on screen.
The Time Portal is a big version of those games you see in kids' travel books and occasionally in the newspaper that involve eyeballing similar images to find differences. "Find 10 differences between these pictures" type of thing. The formula works well in this game, especially hung on a story that may remind you of some creative games from home-computing days past such as
Where in the World is Carmen Sandiego?. Holding back
The Time Portal is a somewhat less than stellar image quality. When the entire game hinges on image quality and detail, it would have been especially nice to see high-res images without jaggies. Perhaps in the editing process things degraded somewhat or perhaps it comes down to screen resolution. Do you really need high-res to play the game? No. Would it make the experience more enjoyable? Yes. The images are very nice and if the creator of the game shot them personally, it is an impressive collection.
There isn't a lot to say about music or sound but there are some amusing sound effects that punctuate the gameplay actions, such as making a wrong choice or finishing a level. The option to play background music from iTunes or a personal library would have been a nice option. Screening photo after photo can either feel relaxing and casual or intense and wearying. Music in the background would make a big difference.