This is great!
There's some really good puzzle design in here, making full use of the mechanics. I particularly enjoyed the one shown in the screenshot, and the final puzzle before reaching the end boss.
Speaking of - the final boss is fantastic! I found it to be exactly the right level of challenge, and very fun to fight. I thought it was a great touch making it faster as it shrinks, and felt it scaled really well at a pace that kept me under pressure even as I got more familiar with the controls without becoming frustrating. I love the track too, reminds me of OG Crash Bandicoot music.
I found that the regular enemies weren't especially interesting to fight by comparison to the boss, but with most of the game being puzzle based this wasn't a big issue.
Thanks for providing so much detail in your devlog by the way! I love SpryTile, but hadn't heard of Aria Maestosa or the Xiaod Bank Soundfont. I really enjoy playing with Soundfonts in general, so I'll be sure to check it out.