Great game, but I have two issues.
Firstly, once you dominate the Okinawa boss, there's nothing to spend your cash on.
Secondly, bows are overpowered! I faced the 1v1v1v1v1v1 level with a bow and 1) didn't die and 2) the highest other score was 3.
A fun playing-style, however it's knocked down by a few key issues.
1) Normally I'm fine with this one, but the number of spelling + grammar mistakes made here is just not funny. Everything from the introduction's 'the Europe' to the 'Thank for playing' at the end ticked me off.
2) GLITCHES! D:< Close button doesn't work, Ice Mages don't slow for a block or two...
3) Apparently, you were inspired by Plants vs Zombies. Neever would've guessed!
However, I don't want to be all negative. I played it all the way through, had fun removing those damned Gryphons and was kept entertained.
You might want to add upgrades to your Mana recovery and to your Mages.