I am impressed that you managed to do a physics based game! Most of the levels mostly amounted to finding the perfect spot, and then spamming the hammer (or in the earlier levels just alternating left and right movement). Still, I somehow found that quite enjoyable. Imagining some more intricate solutions would be needed to keep it entertaining for a longer game though.
As previously mentioned , the heads level was much more difficult than the rest. I had failed like one or two attempts total over the other levels, and then I had to give up on that one after about 15 cycles. In that time I hadden't gotten a single ice cubes into the heater. Once I managed to juggle the ice cube on my head half the way and then shot it the rest, but then it went over the heater instead. More than just difficult though, it din't feel that good trying to juggle the ice as it neither stayed on or bounced off of the head. It mostly just fell to the ground just as you started moving.