Very addictive! I love the vibe and could imagine myself playing this for a while. I could also definitely imagine this being quite fun and competitive if a PvP element was added. Nice job! There is one minor thing: I think the lemon guy with glasses is a bit too OP. Maybe give the enemy a ranged unit as strong as the lemon guy? Other than that, very awesome game! If more is done to it in the future, I think it'd also do well with different arenas or bosses, which get stronger as you progress.