148Apps writes: "In all honesty, though, those are fairly small concerns. Sentinel makes up for its minor (very, very minor!) flaws by pulling off a polished presentation that rivals every other tower defense game in the App Store. The graphics are stellar, the gameplay is fun, and despite the fact that I've got other TD games on my iPod, I'll probably be coming back to this one. Get it while it's priced at a mere two dollars".