So, fantastic job, the artwork, music, and game design are on another level! I didn't have a problem with the gravity, I thought it felt true to a cool little platypus jumping around. Which by the way how do you even think of that? Very cool.
Although not what my hands are used to, I didn't have a problem with the controls until the cat boss when I had to do multiple things at the same time in an unfamiliar schema, so my brain started to take issue lol. I'm sure everyone has their own opinion, but for me I would have preferred wasd movement, jump on space, and teleport on L shift, with the attacks on right handed inputs: either LMB for attack and RMB for shoot, or keys like J/K/L.
But that's honestly still pretty minor in the scheme of things. The teleport is actually really interesting, it adds a whole new dimension of movement that we take for granted so often. If not over, then through! Awesome job, I really enjoyed this a lot!