Gentoo Rescue

Here's an excerpt from Gentoo Rescue's Steam description:

Get penguins home safely in Gentoo Rescue! Penguins must coordinate with walruses, who just want to escape into the water. Items let you break the rules in progressively more extreme ways. They come with drawbacks, though, so tread carefully.

Featuring

• Penguins, walruses, and fish. They bring opposing win criteria, which complements the "blessing and curse" nature of the mechanics.
• Rapidly expanding set of mechanics and emergent interactions.
• Over 300 diverse, hand-crafted levels that are simple, instructive, but deceptively difficult.
• An interconnected network of puzzles with item-based progression and metagame twists.
• Journal for tracking mechanics, which also lists entries needed for the current puzzle.
• A tiered hint system for when you're truly stuck. These teach a deduction-based approach.
• 16 biomes distinguishing areas and mechanics.
• Original music.