Thanks Xorkalar! Haha yeah I didn't have a clever way to spawn the enemies in. I tried making them spawn higher and disabled their collision for a small while before they hit the ground.
In terms of the lag spikes. I uploaded a newer version. I wasn't using GPU Sprites before so anytime enemies/shards spawned the game would have lag spikes.
If you get a chance to try out the newer build let me know if that solved the lag spikes for you :)