Creeper world is unique. Like, It has liquid (creeper) physics on 2D map, plus unique approach with Tower Defence / Real Time Strategy mix, and all of it as a Flash game back in 2012. For its time, it's incredible project. Now - it still holds the solid place. Like, we have just circles and triangles passing energy, yet it all makes sense during gameplay. Literally came back here years later for nostalgia (and to avenge my child self who couldn't understand english)
Game is hard, yes. But it's what srategies are. Use your brain, it's not casual "match-3", we're saving humanity here!