Brilliant game, great concept...
Cute and simple style with a high incentive to replay levels for the bonus hats and a 100% completion.
However, I encountered a bug which (annoying at first), as I predicted would prevent me from completing it. Namely, on resetting your position after getting into an impossible situation, or indeed being reset after getting knocked down (kill is such an inappropriate word for a cute game like this!), crates would shift upwards slightly.
Therefore, when I got to a point in the game, cocked up and reset my position, my character could not fit through a gap between the ceiling and a crate (which through the bug is placed slightly higher than it should be).
The music is varied and fits well with the style, although I think it should probably loop more seemlessly.
Otherwise, I enjoyed it. The customisation of your bull with funny hats is an interesting feature.