Thank you for your feedback and comment. Actually, my goal was to keep the player constantly moving. I thought this could be done by adding different enemy types or collecting things from around to keep the tower alive. But since time goes by so fast and 90% of the game is done by me alone, I didn't think I could keep up, so I did something simple. In the future I will add different maps to the game, make more enemy types, ensure player mobility... Thank you again for your feedback and opinion.