Cool game! Excellent use of the theme, the aesthetics were on point. Would love a few frames of animation on the little robot attacks but time is the enemy of all jam entries haha. I don't know if you know but space bar is enabled for spawning helpers, as is the mouse button. I think it takes a little away from the cool idea of having to go to the button with your mouse to click it. Also I think it would be better to have the upgrade bar fill slowly as it's powered up rather than in chunks. The sound effect stopping makes it a bit unclear what exactly causes it to go up.
I think there's definitely a full mobile game here where you choose upgrades and there's more variety in enemies etc. Great work!