0.2.2 Minor balancing

I'm reducing threat level 1 difficulty for the following reason:

Before 0.2.0, the median time you guys spent beating threat level 1 was 1 hour.
And the median time you spent on your first session was also exactly 1 hour.
Which is nice, because it means the average player had just had enough by the time they reached a significant milestone.

After 0.2.0, those numbers shifted: you still spend the same median time on your first session,
but it now takes 1h11 to beat the first threat level!
Which means a lot of you are getting tired before beating the last boss. That's not optimal, because I want the average player to spend their one hour and feel good about having completed something.

Also, time between threat 1 and 2 where a bit too close together.

I'm going to keep making tiny adjustments until the balance is good again.

Mini-bosses

• Antler: spawn count lowered from 3–20 to 2–16, and max HP scaling lowered from x8 to x7.
• Crow: swarm spawns per wave lowered from 5–24 to 4–17, and max HP scaling lowered from x8 to x7.
• Hawk: units per spawn lowered from 7–20 to 5–17, and max HP scaling lowered from x8 to x7.

Final boss

• Yeti: HP reduced from 60000 to 55000.

Difficulty

• Tier 2: enemy HP multiplier raised from x1.4 to x1.5.