powerupBoss and mantisBoss need nerfs

[kgurchiek]

powerupBoss (the large one, bot the baby) shouldn't have invincibility between stages. When the baby version was the only one with the invincibility, it worked as a tradeoff, since it couldn't go through walls. Now that the large one has it as well, the baby is just a worse version, and the large one might be the strongest level boss in the game.

mantisBoss could probably use an entire rework, it just isn't fun to fight at all. You spend most of the fight just running in circles waiting for it to finally become vulnerable for 2 seconds before being invincible for what feels like another 10 minutes (especially on higher levels). If you don't damage it enough in the tiny window, you have to run around and wait all over again and hope it doesn't become vulnerable while you're around a corner. Its unique mechanic of stealing your ammo isn't even that much of an issue, it's only really problematic if you were about to run out of ammo anyway, and even then you can just go pick up the ammo again. It just feels like an easy mode version of powerupBoss' mechanic. I think it should steal your ammo until it dies, or the ammo could be "stored" in the extra three attached mobs, and you have to kill those to get it back. Maybe they could have a color change to show how full they are.