Nice entry! I noticed that with the right upgrade choices, it seems like you really don't need to use the charge shot, which means you can advance a lot more smoothly through the waves. I got to wave 25 without using the charge shot and used its tradeoffs to upgrade my normal shots instead :)
The ones that grab onto you are scary, and the long ones (idk what they're called) seem to recover a lot of sleep. Nice work on the enemy diversity there