Helleeeuuu. We're making some exciting progress in game design! It's Adriaan's department, so I can't speak to the details of what went on in his brain :P But I can show you some of the screen shots I made during testing and explain what's new. First off, I turned more of our tower designs into pixel assets, and added them to our test level. Here are most of them:
We designed a couple of placeholder enemies, and created larger waves:
And We've put assets on spawn points, so it's clear the enemies spawn out of the Rifts:

We've also added indicators to spawn points, to make building decisions more strategic.
And we made a decision to have resource generators remain inactive when built during a wave, to nudge more towards saving resources for 'engine building' rather than stressing optimizing the exact moment the generator is built. (That's the best I can do at explaining it in 1 sentence :P You'll see what I mean in the demo :D). Here's a gif of the new generator!
More in the next update!

Features

• The whole game with updates and everything (?)

• Some amount of levels (??)

• Multiple hours of gameplay (?!?)

• Many many towers and enemies (?!???!)

• Upgrades, Skill Trees, Challenges, Modifiers, Replayability... we have no idea either!

• If it wasn't clear enough: we don't know precisely (yet) what'll be in the game. We'll announce things as we go right here on Steam, so uhhh... wishlist and find out?!

Made by…

• OS: Linux distribution released after 2016
• Processor: x86_32 CPU with SSE2 instructions. x86_64 CPU. ARMv7 or ARMv8 CPUMemory: 4 GB RAM
• Memory: 4 GB RAM
• Graphics: Integrated graphics with full Vulkan 1.0 support
• Storage: 300 MB available space

• OS: Linux distribution released after 2020
• Processor: x86_32 CPU with SSE2 instructions. x86_64 CPU. ARMv7 or ARMv8 CPUMemory: 8 GB RAM
• Memory: 8 GB RAM
• Graphics: Dedicated graphics with full Vulkan 1.2 support
• Storage: 300 MB available space