First off, the way the sense evolutions change the graphics is lovely both in idea and execution.
Some suggestions:
The UI really wants an option to hide maxed upgrades. The lists get long and you have to scroll past everything every time.
The game presents plant and predator as equal options, but there isn't near as much support for the plant lifestyle. Size categories are measured in what you can swallow, there is no instinct for staying in sunbeams, you're always reliant on mobility and the spike specialization isn't very useful since predators are easy to avoid and you can't eat what you kill. The events besides sunbeams are also geared more towards predators.