I really liked this game! I think the concept is strong, it just needs a bit more fleshing out (which is to say, beyond the scope of a game jam - it's really good for one week!). All of my critiques are minor and are against the grain of an overall quality game with good, creative level design, and awesome music and sound. For one - it's a little unclear what's special about the triangle - it starts unable to push buttons, but has an extra life, and can push buttons afterwards? I think descriptions somewhere or a more plain and simple tutorial style level before the puzzles might've helped with that (granted I had it most of the way figured out by the end regardless, it just took me a while longer than it maybe should've for me to work it out). Another thing is maybe a color difference for the triangle? First life is red, second is white? There's a lot of possible solutions. Also, the boss has some issues - notably that it can make you die 2 times in a row if you die in the first place in a spot where your next life is pinned - but it's very predictable which is always the core of good boss design. Good work overall!