'Sentinel 4: Dark Star' Has Been Submitted to The App Store

Remember the Sentinel series of tower defense games? There's Sentinel: Mars Defense [$0.99], Sentinel 2: Earth Defense [$0.99], Sentinel 3: Homeworld [$2.99], and finally, Sentinel 4: Dark Star which was just submitted to the App Store today. The Sentinel games are consistently great, and while the tower defense genre is definitely about as overstuffed as From Touch Arcade