Custom Level Saving
Just a suggestion for the custom levels. At this point, it's impossible to save your game on them. With the current custom levels on the addons page, it's fine, because they're not that large. But with the possibility that in the future there will be people making larger and more complex levels, I think perhaps it would be a good idea to consider adding a save feature to them, instead of just the "refill station" the custom levels have now. In small levels, it's fine, but if larger levels are made... well, it would be a big pain.