they drop bombs much to early i'v seen one that droped at the border. they should start drop bomb at the other side of screen and a little earlier when it begins to get harder but not earlier than 1/4 of screen fron begining. and it needs autofire
it has some bugs
in the last fight u can kill with one strike but the bat dont disapear and u get only 2 coins and if u lose game and continue u will have only 50 max hp
defenders attack far over theyr range or don't atack at all, it needs upgrades for buildings and both buttons build a building and none cancels
good ideas but not even close to be ready