Overall a nice game, but it could use a bit more challenge. Perhaps incorporate a jumping element where you have to jump over incoming obstacles while shooting the animals.
Why the time limit? Why punish gamers for playing your game? At least give us more than a few years, and balance out stress and resting. Way too much time is wasted on resting. Another idea is to give players an extra year for completing Strongholds. That way there is some pressure to advance, but it's not overwhelming and you get rewarded for advancing.
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