I second all the comments made by thebigtabletop, and would just like to add that the typography and layout, although simple, really meshed well with the atmosphere I think you're trying to evoke with this game. An impressive amount of work for the time period. Good luck!

Nice job! I was hoping I'd see an alien invasion in one of the entries and here it is! I had a few thoughts while reading: 

• Your intro was very solid. I knew exactly what your game was and what the players were going to do. I really appreciated that you included a table of contents. Really upped the presentation.

• Some of the more narrative bits could have used more time (48 hours... still recovering myself, I get it) and more description to set the tone of the invasion. One section, I felt the tone strongest was the Vena tech (in Items).
• Your developmental traits were pretty cool. I wasn't as sure about the Learn one as it might halt player progression. But perhaps not!
• I wanted the beasts, survivors, and Vena to all basically use the same character template... which they more or less did. I suppose when running the game you'd just X out stats that a certain NPC didn't have.
• You have so many mechanics that I found myself really enjoying. The time mechanic was felt cinematic. I always love when someone puts in a wound mechanic that punishes lost health and yours was solid. The age as level was a nice touch. Experiences and horrors I actually wanted more depth just to see where else it could go. And the EXP buy system.... jeez, you packed a lot in during the Jam period!

Again, congrats on finishing! You really packed some cool things in for not a lot of time.