The skill tree allows you to spend skill points to become a better shaman! There are three areas you can train: Spiritual guide, Wind master, Mechanician. The skill tree can be accessed by clicking "Skills" in the menu or by the yellow exploding number icon that appears at the bottom left of the game when there are points available to be allocated.
You can earn skill points by leveling your mouse. Each level gains you a skill point. Experience must be gained to level. Getting cheese and returning to the mouse hole and saving mice while you're shaman gains experience. Each level requires a certain amount of experience.
On the skill tree, you can redistribute the skill points you allocated by clicking the "Redistribute" button. However, redistribution will use cheese, requiring one cheese for every skill point obtained.
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 (a total of 20) are allocated to the fourth row or before.
The last row is unlocked when 6 or more points (a total of 26) are allocated to the fifth row or before.
To get to the last tier quickly, you would need at least 27 levels.
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 your 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.