I, like one of the people below, didn't realise you could carry multiple animals. I also didn't realise you needed two of each species to save said species; while that should have been obvious in hindsight, both could likely have been clarified somewhere ingame.
Also, requiring 2 of a given species does make the game slightly luck-based, as you don't know where the other member of the species is when saving the first one, and may not find it. Perhaps the location of the second member could be revealed after the first one is saved?
The rain and eventual flood appearing on-screen was a nice touch. Giving you points for both theme and graphics for that.
The NPC which said 'I hope it doesn't rain too much' was great, too! Honestly - love that. Hilarious. 5 fun score for that alone.
All in all, great work! This is quite impressive for a first jam game, at least, in my opinion.