This was a lot of fun! Couldn't put it down until I escaped :) And it is cool to see that there is somebody else who took on the "first contact" a little differently like we did :)
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It is difficult, but for me it hit the "hard but enjoyable" spot just right. It was a fun challenge where every time I played it I got a little farther, so it was rewarding. I think I spent around 25 minutes playing it.
One thing that was a bit frustrating was the first alien. You have to hit them with either the first or second stone, and there is a hill in the way that makes it pretty hard. So if this first guy was a little slower, or the hill was not so much in the way, first time players would probably find it a little bit more enjoyable.