I think the game has a really neat concept on display here with some great puzzles to think through, but the execution did feel very rough to me. Not too bad once I got used to it, but I feel like it definitely could've used a bit more smoothness to it.
Just learning the games rules at first was pretty tough. The game does teach you to use the arrow keys and space bar, but it never teaches you the existence of the restart key, which is critical because if you mess up block placement, you might never know that you can restart to place them again. You'd think that dying would restart you from the block placement segment, but for some reason it starts you from after you placed the blocks: I understand why, as perhaps you just died from a bad jump while placing the blocks correctly, but it just felt so unintuitive to me to not restart from block placement automatically.
Once I got over that hump, the game was going pretty well for me. But there were still slight annoyances here and there that hurt my experience:
While I appreciated that you could see a queue of blocks you'd be able to place, it annoyed me that I could only see a few at a time, instead of all of them, as it made it so that I'd always need to place the blocks twice, with the first time being a sacrifice so I could learn the full pattern they'd come in for my second attempt.
Learning the purposes of new blocks was tricky as well, as the graphics weren't always intuitive. Additionally, I found the mechanic of rotating a block to destroy parts of it to be confusing and difficult to pull off consistently.
This might just be me, but I also found it kind of unnecessary to have the placement of blocks so rushed by having the blocks fall automatically: feels like the game could work just fine by allowing you to manually control the blocks, and that would reduce stress and trial and error. I understand its emulating Tetris blocks, but it just sometimes felt like an unnecessary hassle that got in the way.
Overall, I also found the game very muted and lifeless. While the character and other graphics were very cute, I wish the game had a bit more special effects, visual and audio wise, to it all to make elements like victory and block placement feel more satisfying.
Again, it's definitely a really neat concept, and if possible, I'd love to see a more polished and expanded version of this!