Love the game, but have a few suggestions for the sequel: certain monsters are immune to certain gem effects, make the walking controls better (sometimes my hero won't stop walking), make the pet evolution a skill upgrade and get rid of the tower speed upgrade, make coin magnet a skill upgrade, allow the use of extra gems as instant bombs. make a survival mode. Just a few suggestions
fill most of screen with water, dump a little soil in the middle, drop a few seeds onto the soil at the bottom of the water, watch the coral fill the screen, drop a fish into the water to destroy all the coral