even tho i cant get past wave 5 (idk if its the game or myself, but ive heard that it is a difficulty to balance it), this seems like an interesting concept for a tower defence game, however it heavily depends on luck for getting resources... the gear shop is a nice addition to make things a bit more easier. what i will say is that when u can choose an upgrade, make it more clearer if it unlocks a resource or some sort of blueprint. overall, i can really see the potential and theme from the sci-fi appearance and i can interpret trial and error.