Love the mix of Crazy Taxi + Noah's Ark. It's an ambitious idea, but I think you guys have made a really good core of a game. The TruckBoatThing looks great, it controls well, and the core gameplay loop is solid.
It's quite easy to screw yourself over if you don't learn the positions of the animals - i.e. some are low-lying ones with a pair all the way up the hill. By the time you've picked up the other half, it's game over. A more "gated" map, where you don't get sent on such wild goose chases, would have been welcome.
One annoying issue I found was when driving, there'd be constant short bursts of annoying static Might have just been my system with the web-version of godot though.