WASD for movement and firing was fun! I really like playing games like these. I feel like it would have been much more fun to build though if the UI was improved and parts could be deconstructed.
Also I feel like the tutorial should be in the actual game, not just the question mark on the main menu, because I did not notice it until after I beat the game.
I would love to see a fleshed out version of the game with a better UI for building.