Fun little game, I could see myself playing it from time to time, very arcade-ish, and really felt like something that could be on the gameboy, the mechanic of planting the things to attack the enemies reminded me of Heiankyo Alien on the gb.
Having music could make the game even better but at the same time the game feels alright because of the "80's arcade game" look and feel of the game.
Nice job!