One of the greatest 2d platformers and indie games of all time to this day. Its tight and difficult gameplay is so addictive. Finding the way to beat the challenging levels over constant deaths never felt so satisfying. The soundtrack also keeps me pretty hype. The game is uber charming and I love the artstyle and aesthetic. The way each and every level is so intricately designed still amazes me to this day. Also the replay that shows you all your runs of the level makes me feel more satisfied that I finally beat the level. The satisfaction I get from playing this game is almost second to none. This is probably my favorite between this and Isaac but both are masterpieces in their own ways. I'll say I still probably slightly prefer Mario 3 but this comes close to best platformers ever.