Pretty good! Maxed out everything, fun play, but wish there was more to build and discover. 

Also hard to get enough plastic, since that was the most critical resource. I hope that further improvements on the sub will require a more even cost distribution for each resource.

And I hope the sub has many more stages and that it can dive deeper for new resources! Maybe when going really deep, everything is too dark and we'll need to install different kinds of lights? Weak spotlights first and then work up to flood lights? And the arms can only catch what's visible? 

Maybe the resources get more exotic the deeper you go? For lights, we'll need glass, metal and tungsten? At least for the weak ones? Maybe we need a hose to suck up bubbles of xenon gas for the brighter lights?

Anyway, since I'm all maxed out, I'm gonna close the window now. Hope the game is saved so I can continue if there's an update!

500 meters!!!

Very good but at certain parts the progression gets scuffed and music would be great

Nothing ever happens. Science doesn't work, superpowers don't do anything. The way you have to develop land and stuff is okay, though.