Very fun! I could easily see this expanded and a little more polished and working as a cool mobile game! you could do all sorts of stuff like, maybe you are terraforming for multiple alien species, so you need to figure out which planet would be the easiest to meet all the conditions for each species you need to place in a solar system... some might be humans and need exactly what you have here, but others might need Argon to breathe and want a super cold planet, or a perfect mix of Zinon and Oxygen and need 95% of the surface to be water so melting the ice-caps is a good thing! (But little did you know when the ice caps melt they release methane into the atmosphere! oh no your plans are ruined!) Haha, with some more variables, and things that could alter the variables while you are trying to fix things, this could become a very nice puzzle... you might even be able to remove the timer if the puzzle became complex enough (or make a variable timer based on how long each species can last while waiting for their planet to be habitable)
Anyways, very fun little game, hope you keep working on it!