2D seems to be better in flash
I understandi it must be very hard to make a 3D flash game. But maybe it shouldn't be pushed on further. Toxie radd 2 was awsome, but I didn't like this one that much. The characters in the previous episodes looked great, here they are totally angular - wich looks pretty bad. The graphich of this game reminded me to the FPS-es of the early '90-s, like Quake 1 and such. But in them at least you could move freely.
But it's not just the graphics that makes this game much less good than the previous 2. In those you could move freely and there was much variety: many weapons, zombie types and bosses. Here you only have your gatling gun (ok, there are a some powerups but it's still just the same gun), just a few zombie types and you fight the same boss three times, always with the same strategy. Also your movement is very limited - so you can't fall back and leave many powerups behind.
Again, I know it's much harder to make something look good in 3D than in 2D and free movement is also hard to make. But that's why it shouldn't pushed on in flash. Maybe in Unity. But today when the full feature games have beautiful, realistyc graphics and fine movement there is no point in makeing such an fps even for a casual game. For casual games 2D is just fine anyway.