This game is... not that bad actually. It's very faithful to 90s arcade games, both in a positive and negative way. The pixel art is GORGEOUS and the gameplay is simple and intuitive, but once you lose all your lives, you have to start all over again (also, there are no continues... I would have liked an option to add some). Luckily, the campaign is very short (just four levels) and the enemy patterns are relatively easy to learn. Just like older arcade games, it's meant to be replayed over and over to improve your score. There isn't too much content so I would recommend buying it only if it's on sale or in a bundle (which is what I also did).