Sure, if you like features that cause your device to reboot, or simply do not work like a 'name change', then you would love it (amongst heaps of other things - all bugs).
I have tried to discuss this on his board and am yet to recieve a single reply.
The only single reply the developer has ever made to anyone is a single word 'Acknowledged', in the year or two the board has been running.
I am probably over reacting by using the word 'steal'. Hehe.
My version of the idea would end up completely different (this guy's app would be just a source of initial inspiration to get me started). I have been tapping away at code for years trying to come up with an idea that would keep me entertained enough to actually bring to completion.
I think it's fine to see something, and decide you can do better.
Though for the original buggy game - remember that what seem like disastrous bugs to a user may be things that a developer has not seen or cannot reproduce, and especially for an individual developer, they may not have access to many devices to test on. A reboot sounds particularly bad, but that also suggests a bug in the OS to allow that to happen. One can't really expect much support at all for free, though I suppose if he's plastered it with ads, it's no longer completely free. But yes, nothing wrong with trying to do better.