If you see the stay alive for 300 seconds acheviement, reload the game. you're playing the previous version. They uploaded a new one when they put in the card. that cahnges to stay alive 60 seconds.
1) trees bad
2) menu doesn't pause
3) pause doesn't stop new creatures from spawning
4) ran into a bug on L2 where the game said there was 1 more attacker, but it never came.
5) progress not saved
6) no way to turn off the music without turning off all sound
7) no way to find out what the spells do or the units stats without actually trying them.
8) slots are a useless waste of time.
But otherwise, it shows promise.
I'm in the giant walker, and have reached the end of the section where it can go, but I can't get out now. And the path forward is too small for me to fit in it. What do I do now?
I've now finished the game with all the different ending tanks. It's well balanced, none were significantly harder than the others. Just different strategies required.
I've now finished this with the lightest, heaviest, and most middle possible tanks. All are about the same difficulty, they just demand different strategies.
2 bugs:
1) counting is screwed up, I just did a level on beginner, killed > 5 runners and it counted 1.
2) You can't hit more than 2 keys at once, so you can't move diagianally and fire at the same time....
Once you get ahead of the curve cash-wise, it becomes rather boring. as of level 160, I have every buildable space filled with fully upgraded lightning or fire towers, 2million gold in the bank, and only the bosses are surviving long enough to get on the screen. There's nothing left for me to do, but let it run and see how long it can go. Since that's boring, I'll just abort and say I win.
 "Level Up!"){kind=icon}
 "Achievement Unlocked"){kind=icon}
 "Ultimate Defense 2"){kind=icon}
 "intrusion"){kind=icon}
 "Bubble Tanks 2"){kind=icon}
 "Boxhead: The Zombie Wars"){kind=icon}
 "Duels Defense"){kind=icon}
 "Bloons Tower Defense 2"){kind=icon}