Yup... Actually they are already a favorite of mine, mostly because of their MFi implementation on top of the fantastic games they have been dishing out. My wish? I wish they update Repulze with MFi controls. Nonetheless, instabuying new titles from them is a no-brainer.
Space Marshals works perfectly fine on my device. If the engine used is similar, it might well run on it.
The requirements for Xenowerk are set to: iPhone 5 or newer iPad 3 or newer iPod Touch 5 or newer So an iPhone 5s with OS 7 should do just fine!