after watching the pattern for about three moments i cracked the algorithm that spawns your monsters and was able to do a pro run, making some adjustments to your HUD would help make the game easier understand, maybe a bar over Zero's head that shows your wepoin energy and your HP, if your monster dropped capsals that boosted your health and energy that could be cool, so you have a continues run instead of three lives. also i think it would make the game look more streamline if the monsters moved in waves with some variations or if you could walk between screens to change the monsters or the behaviors, what do you think?