Thanks for checking our game out! Yannis (the designer of the mech and the enemies) doesn't really use Itch but, I will pass on the compliment. I haven't actually seen Ironcast before but that makes sense.
The aesthetic we were going for was Magepunk/Aethercore. Similar to Piltover in Arcane/League and Kaladesh from Magic: The Gathering.
Gameplay wise, we initially wanted to increase the originality by having the player swap between inside and outside of the robot/mech. We found out pretty early on that it would be a huge scope increase that we didn't quite have the resources for.