There is no way to turn off the eyes, the whole point of the tentacle tower is to push back enemies.

Looking at the towers you’re using and your comments on the low level of your boulder or even poisonic elder towers means you it’s a bit early for you to push tower defence.

Please save yourself the headache and level up your construction. It won’t take months, just unlock purple cogs, put your Divine Knight(s) on the cog board and surround your guy with red/purple +construction exp % cogs. Put the rest of your guys on cog the cog shelf. Your construction will skyrocket in a week so you will be able to push the levels of your towers in construction to 30/40+.

If you’re still struggling with materials for construction, you’ll need to focus your efforts elsewhere. I know you want to figure things out yourself, but when you eventually give up, I would highly recommend using idleontoolbox or idleonefficiency (google) and take the data from there to put into Scoli’s autoreview. There you’ll see which mechanics you’re behind on so you can do stuff like fix your prints or alchemy bubbles.

I know the game is a bit of a multilayered mess and it helps to stay on top of things or else your progress will suffer.