Definitely needs more gameplay. Especially if the only thing the paid version unlocks is "unlimited growth".
The attacking doesn't seem to do anything.
The other slimes aren't a threat unless you willingly get absorbed.
Once all slimes are absorbed, there's nothing to do.
Slimes will occasionally stop following instructions and refuse to follow up.
Overall, I hope an actual direction is found and actual progress is made. I'm not spending $2 just to unlock unlimited growth, especially if there's no real gameplay to enjoy.