Nothing new.
As said before, Invasion was the original game that came first. I understand you say you took 'inspiration' from it, but I don't see any credits that go to them. You just remade the script in a poor fashion, with an extra idea or two. This isn't making your own script, this is precisely copying what was already made.
'Quite a few hours' simply isn't enough to call like you really put effort into it. You have some of the exact same sounds from Invasion, as I remember it. I'm no fan of Invasion, either, as it is very repetitive. Still, credits are very important.
It's not such a bad game, but I still believe that since it's been done before, it doesn't deserve to be fan-made again.