I love the cat model, fits well with the tone of the game, the upgrade system is neat, the movement is surprisingly good, considering that it is all done via one button, SFX and music were on point. Only things I'd change are either making the text a bit faster or simply adding a "skip" button and, not really a required addition but just as an aesthetic choice, making the mouse cursor as a custom cross-hair (just to complement the "you are shooting here" idea).