My two biggest complaints would be the slow movement speed (feels arbitrary low like BOTW quick speed exhaustion) and the music being very low compared to the SFX. The jump height is also pretty low (a bit like how BeardMage describes it). Other than that the SFX and music are nice, the art as well (just a tiny polishing left I’d say, but it doesn’t help that I started playing video games with the DS and Wii, which had quite high standards already, so my standards are high from what I am most familiar with. It is still very good by itself!), and it is overall very creative! The ending was quite funny as well.
I can’t see the connection to the theme though. Did I miss something? Is it because it is a very resistent animal?