Thanks for playing!
You're absolutely right about the enemy shooting thing. If this was a longer game that would likely be the next twist on the puzzles after the ice tiles. Perhaps I'lll expand on it one day!
Also fair point about the 'bot' being more robot-like than mecha-like. In my case the explanation is simply that the character had to fit within 16 x 16px, which means that the head has to be about half the sprite to look nice , which in turn gives it that 'bot'-like look.