I already told ya Karawasa, but I'll give it a whirl before I head to bed.
1. Illusion waves have 1 hp. They also don't get targeted by towers.
2. Light / Dark / impulse(celestial?) all have range 16, which isn't the same as wc3. Not a bug just thought I'd take note of it. Seems like the range on alot of towers aren't exactly the same, but it's not a problem
3. Nova to Supernova doesnt work but takes your money
- same for Tsunami -> Torrent
4.Plasma towers don't autocast the plasma field. ( take no no autocast right click option either )
5.Tsunami towers dont autocast even WITH the autocast on.
Thats what I encountered with in my first game. More to come when I abuse it some more.