Eukaryotic single celled creatures in the oceans start forming basic sponge-like structures.
The subglacial life undergoes a mass extinction event as heat rises, however some single celled organisms survive, becoming protoplants.
ThingamabobOverseer: yes. space raccoons.
And maybe some aliens will appear after sometime of plants appearing
Protoplants could emerge if you all spam the +1 heat in the comments
+1 protospecies : Due to low heat, no actual civilized life could evolve, but because of the ice and high salt content, subglacial life begins to arise in the ice crater.