The cows are very cute!
The concept is rather... different? It doesn't make much sense but it's funny enough. I appreciate the "KAPOW" effects when cheese hits the UFOs, though it felt a bit weird when the effects came down as if affected by gravity.
I didn't get any music or sound effect. That could really help enhance the mood.
The gameplay got boring real fast and the fences made some cows rather hard to protect. It could use some upgrades or at least being able to dash through the map.
The graphics are good. Especially the cows.
A funny concept that could use more polish.