Thanks for playing. The tutorial is meant to be isolated from the main gameplay loop, your upgrades don't carry over. I see how that can cause some frustration. The three waves thing is also valid, I can tweak spawn credits to be more lenient. What I can't address is your complaints of the core gameplay loop. Fighting elemental guys with counter-elements and upgrading your stuff is just what the game is. The enemies will (and already do) get more involved as you progress through the levels, but if the first batch of content already isn't fun for you, I don't see why that would change with more content.