Hey, I'm the developer of the other looping endless runner tetris game (funny how they are so similar lol).
I love the aesthetic in your version, being set in a bedroom with lego as the tetrominoes.
There were a few things that negatively impacted the experience, the main one being that the player could phase through blocks if they were short enough, which obviously didn't feel great, but I'm sure you realised that already.
I think the choice to have the player automatically jump is an interesting design decision, and while not inherently bad, I feel like it does remove a lot of the skill expression of the platforming aspect. This means almost all the skill expression is in the placing of the tetrominoes, which then naturally makes you kind of think what does the platforming aspect actually add to the experience over just normal tetris.
One other thing to consider is the fact that it is actually beneficial to the player to wait as long as possible between placing the tetrominoes in order to travel as far as possible with the least complex obstacles. I solved this in my game by giving the player exactly one tetromino each loop, however I'm sure there are other ways you could incentivise the player to place the tetromino earlier.
Overall really good for a 4 day jam, hope I didn't sound too harsh just some things to consider in case you want to develop it further.