I enjoyed Shroom Mode! The goal was clear, movement/shooting felt good, and I liked the art style. In an updated version of the game, it might be interesting to include other objectives in addition to killing everything on the board. The game may also benefit from a change to its structure. Instead of having multiple levels with breaks and a fade-to-black in between, you could have one uninterrupted level where new waves of enemies respawn. This would allow the player to focus on managing the rage mode meter more!