I really like this concept and I think it fits the Climate Jam theme really well. It's satisfying to see the campus gradually become greener, and I think the visual progression from gray to colorful will make players feel like they're making a real impact.
The gameplay seems easy to understand and the goals are very clear. My only concern is making sure there are enough meaningful choices so the gameplay doesn't become repetitive after placing a lot of green spaces. Maybe adding more interactions or different types of upgrades later in the game could help keep players engaged. Overall, I think this has a lot of potential and I'm excited to see how it develops.