Very nice! I'm very glad that you had a good bit of fun with our game and nice to hear that you ended with a perfect score too!
I don't think I ever spelled it out but when you catch endangered animals and out them on the Ark you get an Ark health recovery of 1 or 2 at the end of the wave.
Yeah when I wrote the spawner placement code I just followed the square tile collisions so when you hit the corners it will essentially make a nest on the ground haha. I mean to go back and adjust that some because basically all the playtesters mentioned that, but it didnt affect actual gameplay much so I chose to focus on balance and otherwise more.
Thanks again for the comment and feedback!