The Skill Tree allows the player to spend skill points to become a better shaman. There are five areas that players can train in: Spiritual Guide, Wind Master, Mechanician, Wildling, Physicist. The skill tree can be accessed by clicking "Skills" in the menu or the yellow number icon that appears at the bottom left of the game when there are points available to be allocated.
The Wildling and Physicist skill trees are unlocked after you have earned 3680 experience points/gotten to level 20.
You can earn skill points by leveling your mouse up. Each level gains you a skill point. Enough experience points must be gained to level up. Completing maps and saving mice as shaman are ways to obtain experience points. Each level requires a certain amount of experience.
Each row of the tree is unlocked for every 5 skill points you allocate in that area. There is no restriction on how the points need to be allocated within each area, so long as it is in multiples of 5.
The second row is unlocked when 5 points are allocated to the first row.
The third row is unlocked when 5 more points (10 total) are allocated to the second row or before.
The fourth row is unlocked when 5 more points (15 total) are allocated to the third row or before.
The fifth row is unlocked when 5 more points (20 total) are allocated to the fourth row or before.
The last row is unlocked when 6 or more points (26 total) are allocated to the fifth row or before.
Spiritual Guide focuses on saving mice and guiding them to the cheese and mouse hole.
Tier 1 Skills
Adds 5 / 10 / 15 / 20 / 25 seconds to each round.
Makes the cheese bigger by 10 / 20 / 30 / 40 / 50%.
Tier 2 Skills
Increases your Shaman's size by 4 / 8 / 12 / 16 / 20%.
When you dance, you make 1-5 other mice dance around you.
When you die, you can revive once.
Tier 3 Skills
Takes a mouse directly to the hole. Only works if mouse already has cheese. Can be used 1-5 times.
Revives 1-5 dead mice based on skill points allocated.
Gives your cheese to the chosen mouse. Can be used up to 5 times in Divine mode.
Tier 4 Skills
Balls will fall slower.
Teleports a mouse next to you. Can be used 1-5 times.
Summons a bonus that increases the mice's speed. Can be used 3 times.
Tier 5 Skills
Summons an apple. Summon objects inside the apple's summoning range. Can be used 1-5 times.
Keep summoning while you're dead for 4 / 8 / 12 / 16 / 20 seconds.
Summons a bonus that makes mice bounce. Can be used 3 times.
Tier 6 Skills
Summons a cloud. Clouds are platforms that are attached to the background but can move from side to side. If the cloud is rotated 45 degrees, it moves diagonally, etc. It is similar to the companion crate in that objects can be attached to it and it can be re-summoned.