So I made a first small prototype (windows build) with the very basics of the game.
Next steps int the prototyping progress are to first get some good mobile controlls and then optimise the gameplay a lot by trying out new features in different builds.
Here's a look of what the prototype looks like:
|note: the gif is looking darker than the actual game|
You can also download the Windows build and try it yourself (arrow / WASD controls):