I've started this one several times, without time to finish it, but NOW THAT I HAVE...
Blink Blonk is absolutely fantastic. I spend a considerable amount of time trying to solve the puzzles, and even longer trying to break them using wall jumps and block placements, and honestly... There were ZERO places I was able to break the progression. I managed to get to the second-to-top-right room early, but I didn't have 3 blocks to go further, so it still managed to keep me playing fair. Long story short, the level design is just great.
The upgrades you get feel satisfying every time and are at the PERFECT place in the progression. All-in-all, there isn't much I can say bad about it. It's hard to even find criticism. I guess the non-solid blocks could be a little more obvious...? But even that is just grasping for SOMETHING to make this review useful haha. Keep up the amazing work!