The strongest aspect of this game is the level design. You made great choices with turret, spike, and water placement. My biggest suggestion would be to hint at the phase change; the music does teach the player when to expect the "storm" phase, but the change is sudden and somewhat jarring. Perhaps it starts to fade between sky colors when it's about to change? The pixel art of the tiles is great. I encountered no bugs and I found myself wanting more. Great job!