after finishing the game, gotta say, archer + turtle and heal really OP, you dont need any unit beside that, turtle+aura+heal will tank early wave, build 5-8 turtle into field, then spam archer, archer alone will knockback the unit, not working on couple level in chapter 5 *ghost, soccer boss*
i give it 3/5, kinda original idea of defend game but have too much bug and bad designed system, monster AI need some improvement though, sometimes they stalling around even when enemy around
the game rather easy if you spam the triple cannon nonstop, final level, spam 5-8 ball without seeing the actual enemy ship, suddenly it finished the game
overall, its a fun game to play at earlier lvl, much easier later lvl though if you spammed the cannon