Tbh its kinda lacking in game play loop you just get more sheep, also something I have noticed is that the physics function a bit diff in browser.
In terms of mechanics the sheep loose health before slowly and eat the nature spots, the nature spots also lose energy overtime and have 4 diff types, that all look pretty same that have different amounts of energy. the goal is to get as many sheep as possible.
Sheep will die if they go into the vacuum alone for 10s and the player can get stuck in the vacuum being that the hoover dose not recharge in 0 gravity.
Asteroids where supposed to spawn nature seeds on them that could be brought back to get more energy. However that was never really go added.