1. I'm a little surprised no one else has pointed this out, but there's a massive abuse of mechanics you can do where if the blobs are next to your towers, you just start to place a wall or something and the enemies will freeze while the towers mow them down.
Dammit, the bug returned :|. Fixed it on Saturday but apparently reappeared.
2. I also agree with the commenter below that HQ should start with a few collectors by default.
Is a bug, should start with 2 already. I made myself in a deadlock too many times because of this xD