Thanks for trying my game!
If the third enemy doesn't work, it's probably cause I haven't tested it properly. (I usually test just 1 or 2 waves. I didn't realise it was broken)
Towers/turrets should be shooting the enemies that get close to them. I don't think it's meant to shoot through walls. (If it would be more fun for it to go through walls, i'll change it)
Concerning the camera, I'm still experimenting with the resolution and stuff. I'll try to fix the jittering. (it doesn't jitter much on mine.. i think the browser resolution has something to do with it)
I'm going to add more traps as well.
I still have a lot to add before it becomes the game that I have in mind. I'll add a devlog with the things I want to add.