Thanks for playing! I really appreciate the in-depth review as well, it goes a long way to improving the game! The arena colours were one of the last thing I added so I didn't have much time to playtest the game with fresh eyes but I definitely agree it can be hard to see some enemies and projectiles. As for the powerups, I think I'll add an animation for them to either spin or bob up and down so they are easier to see. Thanks for the feedback