Got to 1000 before I got bored. If you ever plan to revisit this game, I would consider phasing out the weakest mobs for tougher versions as you progress, because the game starts to lag with so many on screen at once. Also you can skip the wave with minimal damage by running straight through while invincible (hitting a weak mob and collecting an energy lets you do it for free!), so maybe slow the player as well while they’re invincible.