This is really good! It took me a minute to understand what I was doing, because I didn't scroll down to where it explains the game and I thought I was removing the requested shapes/colors, but that's on me for not reading the page.
The one thing that I didn't realize at first is that the size only matters for the weight not the matching, I was removing anything that was a different size at first until I realized that only mattered for the weight, again that one can kinda be on me though. I do wish the runs were able to run a bit longer though since because of the weight limit it does feel like they're always gonna be short unless you're launching most of the shapes.
The gameplay loop is very enjoyable and snappy, the physics feel just great and launching the shapes is super satisfying, I usually hate screenshake but here I think it works really well actually. Also being able to hit the restart button is a great detail!
The music and SFX are also very good and fit the vibe of the game well, the game is quick paced and I think that's translated into the music very well.
Had a lot of fun with this one, and most of my major issues were more so on me.