Good presentation, easy and intuitive controls, multiple currencies and a pricing schema that doesn't push a single upgrade schedule / allows for choice in how the mech develops. Fun!
A few downsides. 1- EDIT : FIXED IN UPDATE. 2- The in game economy feels WAY off - I have nothing left to spend cores on by level 12 of 30, and drone returns quickly make standard upgrades outpace enemy difficulty in a given zone. 3- Crashes are very common once all the gun systems are up and running, at least on my phone. It's not a brick, and even with all my other apps shut down it is crashing the browser window every half hour or so. 4- When a aspect of the drones is leveled up to 15, it is at its max and cannot be boosted again. But the option is shown, along with a cost (which is not available for selection, even if the player has the currency displayed)