Awesome!
1) Ooh, the ice cube is a great idea! There's something similar in Human Fall Flat and it's a lot of fun to mess around with. I modelled an object that would explode on collision (based on the nitroglycerine in The Incredible Machine), but it got cut due to time.
2) For sure, providing multiple simultaneous control options is on the to-do list! That way, the player will have something convenient no matter what the situation is.
3) Totally agree with this also.
Thanks for your feedback, I appreciate you checking it out!