Thanks so much for supporting our new game, glad you enjoy it!
We're currently working on a pack of scenarios to supplement the game with three different settings and some alternate rules so keep an eye out for that coming ~March. We'll be hosting a jam to create your own scenarios then as well since the system is just perfect for generating survival scenarios. If you have a Discord, we'd love for you to drop into ours and share your homebrew stuff. Also, if you have any more questions we're pretty much always online.
As far as Hunting (Challenges) vs. Contests go, in the vanilla rules your example would play out something like this: Your hunter has bonuses to rolls involving tracking, sneaking up, and attempting to kill their target. As long as there isn't a more direct conflict between the two creatures, the bonuses are still calculated. However, if the initial hunt is unsuccessful and the creature becomes alerted and is actively running away or fighting back, the Contest rolls begin and are an attempt to simulate chaos or luck rather than pure skill. For example: If I'm skilled at Hunting and come across a bear, my skills might go out the window as the creature barrels down on me. At that point, it's less about how well you can track/shoot and more about whether or not one side or the other is lucky in a moment of panic.
That being said: We're releasing some examples in an update soon that adds a bit more depth to combat but mostly encourage you to make it your own. If adding +2 in a combat situation makes sense, go ahead and make it happen :D Just remember, a creature with a D4 against a combatant with a +2 will almost never succeed. Anyway, we hope this helps clarify some things. Hope you drop in to say hello on Discord!