The game feels great to play. The graphics and audio are just perfect. Also the different enemies paired with the simple control to jump and shoot are the right amount of complexity for this game. It all feels right... But: I find the game very hard. That can be a planned decision, which would be totally fine. But me personally I never survived longer than maybe 30 seconds (Not that I am normally any good in those kind of games). Jumping down without knowing what you will land on is a gamble which you always lose when you do it long enough. And if I tried to play it safe the enemies got me for not paying attention to them.
But I still had a great time and think for other players this can be a perfect game.