This game was very well done ! I couldn't find the second ending though or how to feed the poor kitty!
Thanks for the video Pickle. Sadly cat is there just to be killed if you decide so as a "easy meat source" but it is optional (as you know already). I did want to see how many players go for most easy approach even if it means doing something you don't want (I hope at least).
Second ending requires to obtain bunny arms from the gagged up bunny in the ally (red ally, near the gun shop). Shoot the arms off (or use axe which you can get near the cat), then return to "devil bunny". Honestly it's quite short and done to cause some rage moments, so not exactly worth the effort.