This looks like a great start to a game but just needs more content. Here's a little more feedback after I played for a while....
- more things to buy would really open up the gameplay
- have a way to buy an auto clicker so the animals can auto generate the resources
- the sound effects can be a little bit distracting when they are coming from offscreen. instead maybe focus on what the player is doing, like when you click on things it would make sense to give auditory feedback.
- would be cool if the animals react to the environment, like maybe there is grass for the cows to eat.
- id like to see the alien also building outwards, it would really cool if you were building out a farm and the alien was building some alien stuff up there.