Right now high-level players can accomplish things that mid-level and starting players can't even approach, because high-level players can get the alchemist hero right away.
Example: a high-level player can setup a speedbuilder set of repair factories to spam lumber mills, shrink them, and make new ones before the timer even starts. How can anyone who isn't that level (or who just wants to use a different hero) compete with that? I've certainly been trying, but I can't find a way to make it work.
Also, can Cogs of Time change from insta-building 1 building to +20/30/40..100% build/repair speed for 30 seconds? That'd make the Tinker a lot better, especially since he lacks the free skill the Marine and Rocketeer have,