Game is good and has a potential. I do like slow and fast falling and room spining mechanics. i did enjoyed playing it but there is few is things that I didn't really like.
A melee attack is completely useless. It is worth making sure that player has some kind of unique additional task that would force the player to use it, or else remove this mechanic because of its uselessness.
Also, throughout the game, the player has no reason to release the shot button, which forces to strain his finger on one button through whole fight. It would be better to make the gun fire after one tap and the player would just have to aim at the target.