Ah… the walker can return to base if it is on a tile in the inner ring. The tile generation animation at the beginning is very cool. Nice entry.

It took me a couple of turns to realise that I needed my walkers to be in the center to defend the tower but despite that I got lucky with finding resources and won the game on my first attempt. Good concept and nicely implemented. 

The randomness of the tiles (I think) and the lack of unit at the beginning makes it hard to start. Maybe the difficulty curve and parameters should be improved. But otherwise it's a great idea and game !

It's great work! Unluckily, I often take the wrong path and end up getting consumed by the planet — or just end up with a healing pickup. I think it needs a radar feature or maybe an arrow to guide the player, so at least we can reach pickups and get more robots before the enemy arrives.