It's on unreal, which like a lot of other engines, are NOT android port friendly. Either suggest an unreal to android port solution or don't expect one.
And yes, bugs, like EVERY first time, single person dev made indie game project before and after him. Your point?
Yes, it's frustrating, but barring supporting him via sub or patreon, the game is free.... and unless, like me or any other fellow supporter, you are actually contributing to the game.... then asking for the impossible/unreasonable and needlessly pointing out the obvious is.... less than helpful.